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Bifunctional Squaramide‐Catalysed Asymmetric Michael/Hemiketalization/Retro‐Aldol Reaction of Unsaturated Thiazolones with α‐Nitroketones: Synthesis of Chiral 4‐Acyloxythiazole Derivatives
Author(s) -
Song YongXing,
Du DaMing
Publication year - 2019
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.201900901
Subject(s) - squaramide , bifunctional , chemistry , aldol reaction , yield (engineering) , enantioselective synthesis , organocatalysis , michael reaction , cascade reaction , catalysis , cascade , organic chemistry , combinatorial chemistry , chromatography , materials science , metallurgy
An efficient and practical organocatalytic asymmetric cascade Michael/hemiketalization/retro‐aldol reaction of unsaturated thiazolones with α‐nitroketones by using cyclohexanediamine‐derived bifunctional squaramide as the catalyst has been developed. Under mild conditions, a broad range of chiral 4‐acyloxythiazole derivatives were obtained in high yields (up to 98% yield) with excellent enantioselectivities (up to 95% ee ). Meanwhile, a few synthetic transformations have been demonstrated.
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