Gold-catalyzed oxidation of terminal alkynes to glyoxals and their reactions with 2-phenylimidazo[1,2-]pyridines: one-pot synthesis of 1,2-diones
A novel one-pot protocol for the convenient and efficient synthesis of (2-phenylimidazo[1,2- a ]pyridin-3-yl)alkane-1,2-diones ( 3 ) in good yields (32-88%) from 2-phenylimidazo[1,2- a ]pyridines ( 1 ) and terminal alkynes ( 2 ) has been established with a wide range of substrate scope. A tandem rea...
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Published in | Organic & biomolecular chemistry Vol. 19; no. 4; pp. 8735 - 8739 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
CAMBRIDGE
Royal Soc Chemistry
20.10.2021
Royal Society of Chemistry |
Subjects | |
Online Access | Get full text |
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Summary: | A novel one-pot protocol for the convenient and efficient synthesis of (2-phenylimidazo[1,2-
a
]pyridin-3-yl)alkane-1,2-diones (
3
) in good yields (32-88%) from 2-phenylimidazo[1,2-
a
]pyridines (
1
) and terminal alkynes (
2
) has been established with a wide range of substrate scope. A tandem reaction sequence containing gold-catalyzed double oxidations of terminal alkynes to generate glyoxals, nucleophilic addition of 2-phenylimidazo[1,2-
a
]pyridines to glyoxals to yield α-hydroxyl ketones, and oxygenation of the α-hydroxyl ketones to afford the final products
3
under air atmosphere is involved in this method. Simple operation, mild reaction conditions, and widely available substrates make this strategy more affordable.
A one-pot procedure with a tandem reaction sequence of oxidative gold catalysis, nucleophilic addition and oxygenation was employed to synthesize 1,2-diones from 2-phenylimidazo[1,2-
a
]pyridines and terminal alkynes in good yields. |
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Bibliography: | Electronic supplementary information (ESI) available. CCDC For ESI and crystallographic data in CIF or other electronic format see DOI 10.1039/d1ob01507a 2097492 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1477-0520 1477-0539 |
DOI: | 10.1039/d1ob01507a |