Reaction of aldimines and difluoroenoxysilane, an unexpected protocol for the synthesis of 2,2-difluoro-3-hydroxy-1-ones
摘要:
An unexpected reaction of aldimines and difluoroenoxysilane promoted with Zn(OTf)(2) was disclosed. The reaction gave the unexpected Mukaiyama-aldol adducts 3 in excellent yields (up to 87%) with the addition of H2O and the corresponding Mannich-type adduct 4 was not observed in this catalytic system. (C) 2010 Elsevier Ltd. All rights reserved.
An expedient synthesis of α,α-difluoro-β-hydroxy ketones via decarboxylative aldol reaction of α,α-difluoro-β-keto acids with aldehydes
作者:Da-Kang Huang、Zhong-Liang Lei、Yu-Jun Zhu、Zhen-Jiang Liu、Xiao-Jun Hu、Hai-Fang Mao
DOI:10.1016/j.tetlet.2017.07.060
日期:2017.8
A novel decarboxylative aldol reaction of α,α-difluoro-β-keto acids with aldehydes in the absence of any base and metal catalysts has been developed. This reaction provides a highly convenient and efficient method for the synthesis of structurally diverse α,α-difluoro-β-hydroxy ketones in good to excellent yields.
remarkable fluorine effect on “on water” reactions is reported. The CF⋅⋅⋅HO interactions between suitably fluorinated nucleophiles and the hydrogen‐bond network at the phase boundary of oil droplets enable the formation of a unique microstructure to facilitate on water catalyst‐free reactions, which are difficult to realize using nonfluorinated substrates. Accordingly, a highlyefficient on water, catalyst‐free
Metal-mediated Reformatsky reaction of bromodifluoromethyl ketone and aldehyde using water as solvent
作者:Hui Yao、Chun-Ru Cao、Min Jiang、Jin-Tao Liu
DOI:10.1016/j.jfluchem.2013.08.012
日期:2013.12
Water is demonstrated as a suitable solvent for an efficient and environmentally friendly method for the synthesis of α,α-difluorinated β-hydroxy carbonyl compounds through the Reformatsky reaction of bromodifluoromethyl ketones with aldehydes in the presence of Zn/CuCl at room temperature.
Synthesis of Fluorinated β-Ketosulfones and <i>gem</i>-Disulfones by Nucleophilic Fluoroalkylation of Esters and Sulfinates with Di- and Monofluoromethyl Sulfones
作者:Chuanfa Ni、Laijun Zhang、Jinbo Hu
DOI:10.1021/jo900320b
日期:2009.5.15
An efficient and practically useful method for the preparation of alpha-functionalized mono- and difluoro(phenylsulfonyl)methanes by using a nucleophilic fluoroalkylation methodology was developed. alpha,alpha-Difluoro-P-ketosulfones, alpha-monofluoro-beta-ketosulfones, and alpha-fluoro disulfones were successfully prepared in excellent yields by nucleophilic fluoroalkylation of esters and sulfinates with PhSO2CF2H and PhSO2CH2F reagents.