First Tandem Asymmetric Conjugate Addition of Alkenyl Nucleophiles and Silyl Trapping of the Intermediate Enolates
The tandem asymmetric conjugate addition of alkyl or aryl groups to enones and subsequent silyl trapping has already been achieved and yields valuable silyl enol ethers. Herein, the first method for the respective addition of alkenyl groups is reported, which is based on a rhodium(I)‐catalyzed addit...
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Published in | Advanced synthesis & catalysis Vol. 355; no. 13; pp. 2651 - 2658 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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Weinheim
WILEY-VCH Verlag
16.09.2013
WILEY‐VCH Verlag Wiley |
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Abstract | The tandem asymmetric conjugate addition of alkyl or aryl groups to enones and subsequent silyl trapping has already been achieved and yields valuable silyl enol ethers. Herein, the first method for the respective addition of alkenyl groups is reported, which is based on a rhodium(I)‐catalyzed addition of readily available alkenylzirconocenes. As prerequisite for silyl trapping, the initially formed enolates have to be transmetalated from zirconium to lithium by treatment with methyllithium prior to addition of the silyl chloride. Starting from 5‐ to 7‐membered cycloalkenones, the respective silyl enol ethers were obtained in excellent yields and ≥93% ee; an acyclic substrate furnished a moderate enantioselectivity. Besides trimethylsilyl chloride, the silylation was also performed with tert‐butyldimethylsilyl chloride, and the synthetic scope was evaluated by employing five different alkenyl groups. Moreover, the mechanism of this sequence was elucidated by 1H NMR studies, and the efficiency of catalyst control was exemplified by synthesis of a cis‐3,5‐disubstituted cyclohexanone which, due to strong substrate control, cannot be obtained by copper‐catalyzed conjugate addition. |
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AbstractList | The tandem asymmetric conjugate addition of alkyl or aryl groups to enones and subsequent silyl trapping has already been achieved and yields valuable silyl enol ethers. Herein, the first method for the respective addition of alkenyl groups is reported, which is based on a rhodium(I)‐catalyzed addition of readily available alkenylzirconocenes. As prerequisite for silyl trapping, the initially formed enolates have to be transmetalated from zirconium to lithium by treatment with methyllithium prior to addition of the silyl chloride. Starting from 5‐ to 7‐membered cycloalkenones, the respective silyl enol ethers were obtained in excellent yields and ≥93% ee; an acyclic substrate furnished a moderate enantioselectivity. Besides trimethylsilyl chloride, the silylation was also performed with tert‐butyldimethylsilyl chloride, and the synthetic scope was evaluated by employing five different alkenyl groups. Moreover, the mechanism of this sequence was elucidated by 1H NMR studies, and the efficiency of catalyst control was exemplified by synthesis of a cis‐3,5‐disubstituted cyclohexanone which, due to strong substrate control, cannot be obtained by copper‐catalyzed conjugate addition. Abstract The tandem asymmetric conjugate addition of alkyl or aryl groups to enones and subsequent silyl trapping has already been achieved and yields valuable silyl enol ethers. Herein, the first method for the respective addition of alkenyl groups is reported, which is based on a rhodium(I)‐catalyzed addition of readily available alkenylzirconocenes. As prerequisite for silyl trapping, the initially formed enolates have to be transmetalated from zirconium to lithium by treatment with methyllithium prior to addition of the silyl chloride. Starting from 5‐ to 7‐membered cycloalkenones, the respective silyl enol ethers were obtained in excellent yields and ≥93% ee ; an acyclic substrate furnished a moderate enantioselectivity. Besides trimethylsilyl chloride, the silylation was also performed with tert ‐butyldimethylsilyl chloride, and the synthetic scope was evaluated by employing five different alkenyl groups. Moreover, the mechanism of this sequence was elucidated by 1 H NMR studies, and the efficiency of catalyst control was exemplified by synthesis of a cis ‐3,5‐disubstituted cyclohexanone which, due to strong substrate control, cannot be obtained by copper‐catalyzed conjugate addition. magnified image The tandem asymmetric conjugate addition of alkyl or aryl groups to enones and subsequent silyl trapping has already been achieved and yields valuable silyl enol ethers. Herein, the first method for the respective addition of alkenyl groups is reported, which is based on a rhodium(I)-catalyzed addition of readily available alkenylzirconocenes. As prerequisite for silyl trapping, the initially formed enolates have to be transmetalated from zirconium to lithium by treatment with methyllithium prior to addition of the silyl chloride. Starting from 5- to 7-membered cycloalkenones, the respective silyl enol ethers were obtained in excellent yields and 93% ee; an acyclic substrate furnished a moderate enantioselectivity. Besides trimethylsilyl chloride, the silylation was also performed with tert-butyldimethylsilyl chloride, and the synthetic scope was evaluated by employing five different alkenyl groups. Moreover, the mechanism of this sequence was elucidated by (HNMR)-H-1 studies, and the efficiency of catalyst control was exemplified by synthesis of a cis-3,5-disubstituted cyclohexanone which, due to strong substrate control, cannot be obtained by copper-catalyzed conjugate addition. The tandem asymmetric conjugate addition of alkyl or aryl groups to enones and subsequent silyl trapping has already been achieved and yields valuable silyl enol ethers. Herein, the first method for the respective addition of alkenyl groups is reported, which is based on a rhodium(I)-catalyzed addition of readily available alkenylzirconocenes. As prerequisite for silyl trapping, the initially formed enolates have to be transmetalated from zirconium to lithium by treatment with methyllithium prior to addition of the silyl chloride. Starting from 5- to 7-membered cycloalkenones, the respective silyl enol ethers were obtained in excellent yields and greater than or equal to 93% ee; an acyclic substrate furnished a moderate enantioselectivity. Besides trimethylsilyl chloride, the silylation was also performed with tert-butyldimethylsilyl chloride, and the synthetic scope was evaluated by employing five different alkenyl groups. Moreover, the mechanism of this sequence was elucidated by super(1)H NMR studies, and the efficiency of catalyst control was exemplified by synthesis of a cis-3,5-disubsti-tuted cyclohexanone which, due to strong substrate control, cannot be obtained by copper-catalyzed conjugate addition. |
Author | Westmeier, Johannes Pfaff, Christopher Siewert, Jürgen von Zezschwitz, Paultheo |
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Keywords | ENANTIOSELECTIVE SYNTHESIS ALDOL REACTIONS asymmetric catalysis conjugate addition enones STREPTOMYCES SP RHODIUM-CATALYZED 1,4-ADDITION KINETIC RESOLUTION DIENE LIGANDS SPIRODIONIC ACID zirconium PHOSPHINE-PHOSPHITE LIGANDS GRIGNARD-REAGENTS rhodium |
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Snippet | The tandem asymmetric conjugate addition of alkyl or aryl groups to enones and subsequent silyl trapping has already been achieved and yields valuable silyl... Abstract The tandem asymmetric conjugate addition of alkyl or aryl groups to enones and subsequent silyl trapping has already been achieved and yields valuable... |
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SubjectTerms | asymmetric catalysis Asymmetry Chemistry Chemistry, Applied Chemistry, Organic Chlorides conjugate addition Conjugates enones Ethers Nucleophiles Physical Sciences rhodium Science & Technology Synthesis Trapping Zirconium |
Title | First Tandem Asymmetric Conjugate Addition of Alkenyl Nucleophiles and Silyl Trapping of the Intermediate Enolates |
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