Phosphine-Relayed Aldehyde-Olefination and Aza-Wittig Reaction with 2,2,2-Trifluorodiazoethane
作者:Fa-Guang Zhang、Ning Lv、Yan Zheng、Jun-An Ma
DOI:10.1002/cjoc.201800158
日期:2018.8
Phosphine‐relayed olefination and aza‐Wittigreactions of readily available aldehydes with 2,2,2‐trifluorodiazoethane (CF3CHN2) have been realized. This protocol enables the facile construction of a series of trifluoromethylated alkenes and hydrazones in good to high yield under mild conditions.
An I2O5-promoted decarboxylative trifluoromethylation of cinnamic acids
作者:Xiao-Jie Shang、Zejiang Li、Zhong-Quan Liu
DOI:10.1016/j.tetlet.2014.11.076
日期:2015.1
An I2O5-promoted decarboxylative trifluoromethylation of a series of cinnamicacids and their derivatives by using sodium trifluoromethanesulfinate in aqueous media was demonstrated. This strategy provides a safe and convenient access to various trifluoromethylated (E)-alkenes in a very high selectivity.
通过在水性介质中使用三氟甲亚磺酸钠,对一系列肉桂酸及其衍生物进行了I 2 O 5促进的脱羧三氟甲基化反应。该策略提供了以非常高的选择性安全便捷地获得各种三氟甲基化(E)烯烃的方法。
Julia–Kocienski approach to trifluoromethyl-substituted alkenes
作者:Deborah O. Ayeni、Samir K. Mandal、Barbara Zajc
DOI:10.1016/j.tetlet.2013.08.069
日期:2013.11
A Julia-Kocienski approach to trifluoromethyl-substituted alkenes was evaluated in the reactions of 1,3-benzothiazol-2-yl, 1-phenyl-1H-tetrazol-5-yl, and 1-tbutyl-1H-tetrazol-5-yl 2,2,2-trifluoroethyl sulfones with aldehydes. Among the various conditions tested, the best yields were obtained with 1-phenyl-1H-tetrazol-5-yl 2,2,2-trifluoroethyl sulfone, in CsF-mediated, room temperature olefinations in DMSO. Aromatic aldehydes gave (trifluoromethyl)vinyl derivatives in 23-86% yields, with generally moderate stereoselectivity. Straightforward synthesis of the Julia-Kocienski reagent, and conversion to trifluoromethyl-substituted alkenes under mild reaction conditions, are the advantages of this approach. (C) 2013 Elsevier Ltd. All rights reserved.