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Letters in Organic Chemistry

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ISSN (Print): 1570-1786
ISSN (Online): 1875-6255

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Letter Article

Enantioselective Synthesis of Coumarins Catalyzed by Chiral Squaramide

Author(s): Zhijing Liu, Zhiwei Ma*, Chuanchuan Wang, Degang Ding, Juntao Liu, Xiaopei Chen and Guangwei Geng

Volume 19, Issue 11, 2022

Published on: 19 April, 2022

Page: [919 - 923] Pages: 5

DOI: 10.2174/1570178619666220309155353

Price: $65

Abstract

A newly chiral tertiary amine-squaramide has successfully developed and applied into the asymmetric Michael addition of 4-hydroxycoumarin to β,γ-unsaturated α-ketoesters. The catalyst system performed well with a low catalyst loading of 1 mol% under mild reaction conditions. A series of coumarin derivatives were obtained with good yields and enantioselectivities.

Keywords: Coumarin derivatives, Michael addition, organocatalysis, squaramides, β, γ-unsaturated α-ketoesters, 4-hydroxycoumarin.

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