Chameleon Reactivity of the Allene Bond of 4-Vinylidene-2-oxazolidinone: Novel Through-Space Conjugative Nucleophilic Addition of Electron-Rich Alkenes and Hetero-Nucleophiles
The CαCβ double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a through‐space interaction with the NSO2 bond; the carbamate double bond is thus subject to nucleophilic addition for a wide variety of nucleophiles, which procee...
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Published in | Chemistry : a European journal Vol. 13; no. 34; pp. 9686 - 9702 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag
01.01.2007
WILEY‐VCH Verlag Wiley |
Subjects | |
Online Access | Get full text |
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Abstract | The CαCβ double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a through‐space interaction with the NSO2 bond; the carbamate double bond is thus subject to nucleophilic addition for a wide variety of nucleophiles, which proceeds under mild conditions by heating at 70–100 °C. Depending on the kind of nucleophiles, 1 displays three different reaction modes: 1) Typically enol ethers and allylsilanes promote 1,3‐sulfonyl migration of 1 and undergo the inverse electron demand Diels–Alder reaction with the 1‐aza‐1,3‐butadiene intermediates II thus formed to furnish bicyclic 2‐alkoxy‐5‐sulfonyltetrahydropyridines 2 and 2‐silylmethyl‐5‐sulfonyltetrahydropyridines 3, respectively, with high regio‐ and stereoselectivity and retention of configuration of the double bonds of these electron‐rich alkenes; 2) silanes (RnSiH4−n, n=1–3) and thiols deliver the hydride and the thiolate at the Cβ carbon and promote the 1,3‐sulfonyl migration, followed by protonation of the thus‐formed carbamate anion (Z)‐III to provide, for example, (Z)‐4 a and (Z)‐4 j, respectively; 3) alcohols simply add to the CαCβ double bond and provide (E)‐6. Usually, the reaction with alcohols is accompanied by the second pathway, giving rise to, for example, (Z)‐4 b in addition to (E)‐6 b. Phenol engages in the third pathway and provides (E)‐6 g exclusively. Heteroaromatics, such as furans and benzofurans follow the first pathway, however, in a different regioselectivity from enol ethers and allylsilanes, delivering the oxygen atom at the 3‐position of 5‐sulfonyltetrahydropyridines (2 g and 2 h). Indoles, on the other hand, show a dichotomy, equally enjoying the first and the third pathways and provide mixtures of (E)‐7 and (E)‐8, respectively.
Through‐space conjugative attack by neutral C‐, O‐, and S‐nucleophiles upon Cβ (see scheme) causes NSO2 bond cleavage of 1 and sulfonyl group migration from N to Cα to generate 3‐sulfonyl‐1‐aza‐1,3‐butadiene, a reactive 4π‐component intermediate for the inverse electron demand Diels–Alder reaction. |
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AbstractList | The CαCβ double bond of allene carbamates
1
serves as an electron acceptor similar to the double bond of conjugated enones by means of a through‐space interaction with the NSO
2
bond; the carbamate double bond is thus subject to nucleophilic addition for a wide variety of nucleophiles, which proceeds under mild conditions by heating at 70–100 °C. Depending on the kind of nucleophiles,
1
displays three different reaction modes: 1) Typically enol ethers and allylsilanes promote 1,3‐sulfonyl migration of
1
and undergo the inverse electron demand Diels–Alder reaction with the 1‐aza‐1,3‐butadiene intermediates
II
thus formed to furnish bicyclic 2‐alkoxy‐5‐sulfonyltetrahydropyridines
2
and 2‐silylmethyl‐5‐sulfonyltetrahydropyridines
3
, respectively, with high regio‐ and stereoselectivity and retention of configuration of the double bonds of these electron‐rich alkenes; 2) silanes (R
n
SiH
4−
n
,
n
=1–3) and thiols deliver the hydride and the thiolate at the Cβ carbon and promote the 1,3‐sulfonyl migration, followed by protonation of the thus‐formed carbamate anion (
Z
)‐
III
to provide, for example, (
Z
)‐
4 a
and (
Z
)‐
4 j
, respectively; 3) alcohols simply add to the CαCβ double bond and provide (
E
)‐
6
. Usually, the reaction with alcohols is accompanied by the second pathway, giving rise to, for example, (
Z
)‐
4 b
in addition to (
E
)‐
6 b
. Phenol engages in the third pathway and provides (
E
)‐
6 g
exclusively. Heteroaromatics, such as furans and benzofurans follow the first pathway, however, in a different regioselectivity from enol ethers and allylsilanes, delivering the oxygen atom at the 3‐position of 5‐sulfonyltetrahydropyridines (
2 g
and
2 h
). Indoles, on the other hand, show a dichotomy, equally enjoying the first and the third pathways and provide mixtures of (
E
)‐
7
and (
E
)‐
8
, respectively. The Calpha==Cbeta double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a through-space interaction with the N--SO2 bond; the carbamate double bond is thus subject to nucleophilic addition for a wide variety of nucleophiles, which proceeds under mild conditions by heating at 70-100 degrees C. Depending on the kind of nucleophiles, 1 displays three different reaction modes: 1) Typically enol ethers and allylsilanes promote 1,3-sulfonyl migration of 1 and undergo the inverse electron demand Diels-Alder reaction with the 1-aza-1,3-butadiene intermediates II thus formed to furnish bicyclic 2-alkoxy-5-sulfonyltetrahydropyridines 2 and 2-silylmethyl-5-sulfonyltetrahydropyridines 3, respectively, with high regio- and stereoselectivity and retention of configuration of the double bonds of these electron-rich alkenes; 2) silanes (RnSiH4-n, n=1-3) and thiols deliver the hydride and the thiolate at the Cbeta carbon and promote the 1,3-sulfonyl migration, followed by protonation of the thus-formed carbamate anion (Z)-III to provide, for example, (Z)-4 a and (Z)-4 j, respectively; 3) alcohols simply add to the Calpha==Cbeta double bond and provide (E)-6. Usually, the reaction with alcohols is accompanied by the second pathway, giving rise to, for example, (Z)-4 b in addition to (E)-6 b. Phenol engages in the third pathway and provides (E)-6 g exclusively. Heteroaromatics, such as furans and benzofurans follow the first pathway, however, in a different regioselectivity from enol ethers and allylsilanes, delivering the oxygen atom at the 3-position of 5-sulfonyltetrahydropyridines (2 g and 2 h). Indoles, on the other hand, show a dichotomy, equally enjoying the first and the third pathways and provide mixtures of (E)-7 and (E)-8, respectively.The Calpha==Cbeta double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a through-space interaction with the N--SO2 bond; the carbamate double bond is thus subject to nucleophilic addition for a wide variety of nucleophiles, which proceeds under mild conditions by heating at 70-100 degrees C. Depending on the kind of nucleophiles, 1 displays three different reaction modes: 1) Typically enol ethers and allylsilanes promote 1,3-sulfonyl migration of 1 and undergo the inverse electron demand Diels-Alder reaction with the 1-aza-1,3-butadiene intermediates II thus formed to furnish bicyclic 2-alkoxy-5-sulfonyltetrahydropyridines 2 and 2-silylmethyl-5-sulfonyltetrahydropyridines 3, respectively, with high regio- and stereoselectivity and retention of configuration of the double bonds of these electron-rich alkenes; 2) silanes (RnSiH4-n, n=1-3) and thiols deliver the hydride and the thiolate at the Cbeta carbon and promote the 1,3-sulfonyl migration, followed by protonation of the thus-formed carbamate anion (Z)-III to provide, for example, (Z)-4 a and (Z)-4 j, respectively; 3) alcohols simply add to the Calpha==Cbeta double bond and provide (E)-6. Usually, the reaction with alcohols is accompanied by the second pathway, giving rise to, for example, (Z)-4 b in addition to (E)-6 b. Phenol engages in the third pathway and provides (E)-6 g exclusively. Heteroaromatics, such as furans and benzofurans follow the first pathway, however, in a different regioselectivity from enol ethers and allylsilanes, delivering the oxygen atom at the 3-position of 5-sulfonyltetrahydropyridines (2 g and 2 h). Indoles, on the other hand, show a dichotomy, equally enjoying the first and the third pathways and provide mixtures of (E)-7 and (E)-8, respectively. The CαCβ double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a through‐space interaction with the NSO2 bond; the carbamate double bond is thus subject to nucleophilic addition for a wide variety of nucleophiles, which proceeds under mild conditions by heating at 70–100 °C. Depending on the kind of nucleophiles, 1 displays three different reaction modes: 1) Typically enol ethers and allylsilanes promote 1,3‐sulfonyl migration of 1 and undergo the inverse electron demand Diels–Alder reaction with the 1‐aza‐1,3‐butadiene intermediates II thus formed to furnish bicyclic 2‐alkoxy‐5‐sulfonyltetrahydropyridines 2 and 2‐silylmethyl‐5‐sulfonyltetrahydropyridines 3, respectively, with high regio‐ and stereoselectivity and retention of configuration of the double bonds of these electron‐rich alkenes; 2) silanes (RnSiH4−n, n=1–3) and thiols deliver the hydride and the thiolate at the Cβ carbon and promote the 1,3‐sulfonyl migration, followed by protonation of the thus‐formed carbamate anion (Z)‐III to provide, for example, (Z)‐4 a and (Z)‐4 j, respectively; 3) alcohols simply add to the CαCβ double bond and provide (E)‐6. Usually, the reaction with alcohols is accompanied by the second pathway, giving rise to, for example, (Z)‐4 b in addition to (E)‐6 b. Phenol engages in the third pathway and provides (E)‐6 g exclusively. Heteroaromatics, such as furans and benzofurans follow the first pathway, however, in a different regioselectivity from enol ethers and allylsilanes, delivering the oxygen atom at the 3‐position of 5‐sulfonyltetrahydropyridines (2 g and 2 h). Indoles, on the other hand, show a dichotomy, equally enjoying the first and the third pathways and provide mixtures of (E)‐7 and (E)‐8, respectively. Through‐space conjugative attack by neutral C‐, O‐, and S‐nucleophiles upon Cβ (see scheme) causes NSO2 bond cleavage of 1 and sulfonyl group migration from N to Cα to generate 3‐sulfonyl‐1‐aza‐1,3‐butadiene, a reactive 4π‐component intermediate for the inverse electron demand Diels–Alder reaction. The Calpha==Cbeta double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a through-space interaction with the N--SO2 bond; the carbamate double bond is thus subject to nucleophilic addition for a wide variety of nucleophiles, which proceeds under mild conditions by heating at 70-100 degrees C. Depending on the kind of nucleophiles, 1 displays three different reaction modes: 1) Typically enol ethers and allylsilanes promote 1,3-sulfonyl migration of 1 and undergo the inverse electron demand Diels-Alder reaction with the 1-aza-1,3-butadiene intermediates II thus formed to furnish bicyclic 2-alkoxy-5-sulfonyltetrahydropyridines 2 and 2-silylmethyl-5-sulfonyltetrahydropyridines 3, respectively, with high regio- and stereoselectivity and retention of configuration of the double bonds of these electron-rich alkenes; 2) silanes (RnSiH4-n, n=1-3) and thiols deliver the hydride and the thiolate at the Cbeta carbon and promote the 1,3-sulfonyl migration, followed by protonation of the thus-formed carbamate anion (Z)-III to provide, for example, (Z)-4 a and (Z)-4 j, respectively; 3) alcohols simply add to the Calpha==Cbeta double bond and provide (E)-6. Usually, the reaction with alcohols is accompanied by the second pathway, giving rise to, for example, (Z)-4 b in addition to (E)-6 b. Phenol engages in the third pathway and provides (E)-6 g exclusively. Heteroaromatics, such as furans and benzofurans follow the first pathway, however, in a different regioselectivity from enol ethers and allylsilanes, delivering the oxygen atom at the 3-position of 5-sulfonyltetrahydropyridines (2 g and 2 h). Indoles, on the other hand, show a dichotomy, equally enjoying the first and the third pathways and provide mixtures of (E)-7 and (E)-8, respectively. The C alpha=C beta double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a through-space interaction with the N-SO2 bond: the carbarnate double bond is thus subject to nucleophilic addition for a wide variety of nucleophiles, which proceeds under mild conditions by heating at 70-100 degrees C. Depending on the kind of nucleophiles, 1 displays three different reaction modes: 1) Typically enol ethers and allylsilanes promote 1,3-sulfonyl migration of 1 and undergo the inverse electron demand Diels-Alder reaction with the 1-aza-1,3-butadiene intermediates Pi thus formed to furnish bidyclic 2-alkoxy-5-sulfonyltetrahydropyridines 2 and 2-silylmethyl-5-suffonyltetrahydropyridines 3, respectively, with high regio- and stereoselectivity and retention of configuration of the double bonds of these electron-rich alkenes; 2) silanes (RnSiH4-n, n=1-3) and thiols deliver the hydride and the thiolate at the C beta carbon and promote the 1,3-sulfonyl migration, followed by protonation of the thus-formed carbarnate anion (Z)-III to provide, for example, (Z)-4a and (Z)4j, respectively; 3) alcohols simply add to the C alpha-C beta double bond and provide (E)-6. Usually, the reaction with alcohols is accompanied by the second pathway, giving rise to, for example, (Z)-4b in addition to (E)-6b. Phenol engages in the third pathway and provides (E)-6g exclusively. Heteroaromatics, such as furans and benzofurans follow the first pathway, however, in a different regioselectivity from enol ethers and allylsilanes, delivering the oxygen atom at the 3-position of 5-sulfonyltetrahydropyridines (2g and 2h). Indoles, on the other hand, show a dichotomy, equally enjoying the first and the third pathways and provide mixtures of (E)-7 and (E)-8, respectively. |
Author | Tamaru, Yoshinao Horino, Yoshikazu Mori, Masahiko Kimura, Masanari |
Author_xml | – sequence: 1 givenname: Masanari surname: Kimura fullname: Kimura, Masanari organization: Graduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan – sequence: 2 givenname: Yoshikazu surname: Horino fullname: Horino, Yoshikazu organization: Department of Applied Chemistry, Graduate School of Science and Engineering, University of Toyama, 3190 Gohuku, Toyama 930-8555, Japan – sequence: 3 givenname: Masahiko surname: Mori fullname: Mori, Masahiko organization: Graduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan – sequence: 4 givenname: Yoshinao surname: Tamaru fullname: Tamaru, Yoshinao email: tamaru@net.nagasaki-u.a organization: Department of Applied Chemistry, Faculty of Engineering, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki 852-8521, Japan |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/17768719$$D View this record in MEDLINE/PubMed |
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ContentType | Journal Article |
Copyright | Copyright © 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim |
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ISSN | 0947-6539 |
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Issue | 34 |
Keywords | COUPLING-CYCLIZATION REACTION ACID NITROGEN-HETEROCYCLES ENOL ETHERS EFFICIENT SYNTHESIS FURAN-DIENE sulfonamides RADICAL CATALYZED ISOMERIZATION 3+2 CYCLOADDITION enols Diels-Alder reactions allenes indoles STEREOSELECTIVE-SYNTHESIS DEMAND DIELS-ALDER |
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Notes | Scientific Research on Priority Areas "Advanced Molecular Transformations of Carbon Resources" istex:72AC13DDC7EA2CDDE8537D9E6B689591D24DB6A6 Ministry of Education, Science, Sports and Culture, Japanese Government, Grant-in-Aid for Scientific Research B ark:/67375/WNG-L1RWWFVM-D ArticleID:CHEM200700691 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
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PublicationTitle | Chemistry : a European journal |
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Snippet | The CαCβ double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a through‐space... The CαCβ double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a through‐space... The C alpha=C beta double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a... The Calpha==Cbeta double bond of allene carbamates 1 serves as an electron acceptor similar to the double bond of conjugated enones by means of a through-space... |
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SubjectTerms | allenes Chemistry Chemistry, Multidisciplinary Diels-Alder reactions enols indoles Physical Sciences Science & Technology sulfonamides |
Title | Chameleon Reactivity of the Allene Bond of 4-Vinylidene-2-oxazolidinone: Novel Through-Space Conjugative Nucleophilic Addition of Electron-Rich Alkenes and Hetero-Nucleophiles |
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