Synthesis 2021; 53(09): 1597-1604
DOI: 10.1055/s-0040-1705976
paper

An Efficient Substrate-Induced Method for the Synthesis of CF3-Substituted Cyclopropanes by Metal-Free Reaction of Trifluoromethyl Styrylisoxazoles with Nitromethane

Qing-he Zhao
a   Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Bejing 100700, P. R. of China
,
Guang-hao Yu
a   Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Bejing 100700, P. R. of China
,
Ye-chen Meng
c   Hengshui No. 5 Middle School, Shengli West Road, Hengshui, Hebei Province, P. R. of China
,
Feng Sui
a   Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Bejing 100700, P. R. of China
,
Mi-yi Yang
a   Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Bejing 100700, P. R. of China
,
Li Liu
a   Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Bejing 100700, P. R. of China
,
Hui-jie Li
a   Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Bejing 100700, P. R. of China
,
Feng Li
b   College of Chemistry and Chemical Engineering, Shangqiu Normal University, 298 Wenhua Road, Shangqiu, Henan 476000, P. R. of China
,
Hai Ma
a   Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Bejing 100700, P. R. of China
› Institutsangaben
We thank the Voluntary Program of China Academy of Chinese Medical Sciences (ZZ0908028) for financial support.


Abstract

A series of (trifluoromethyl)cyclopropanes (TFCPs) tolerating a broad range of functional groups, known as tert-butyl bioisosteres, have been obtained from the cyclization reaction between nitromethane­ and 5-[β-(trifluoromethyl)styryl]isoxazoles in 70–94% yields and 75:25 to 90:10 dr. This method offers practical access to this cyclopropyl moiety of pharmacological interest, employing an inorganic base under phase-transfer conditions.

Supporting Information



Publikationsverlauf

Eingereicht: 02. Oktober 2020

Angenommen nach Revision: 21. Oktober 2020

Artikel online veröffentlicht:
19. November 2020

© 2020. Thieme. All rights reserved

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany