Convenient Synthesis of Difluoromethyl Alcohols from Both Enolizable and Non-Enolizable Carbonyl Compounds with Difluoromethyl Phenyl Sulfone
作者:G. K. Surya Prakash、Jinbo Hu、Ying Wang、George A. Olah
DOI:10.1002/ejoc.200500101
日期:2005.6
difluoromethylation of carbonyl compounds (both enolizable and non-enolizable aldehydes and ketones) has been achieved by using a nucleophilic (phenylsulfonyl)difluoromethylation-reductive desul-fonylation strategy. Difluoromethylphenylsulfone acts as a difluoromethyl anion ("CF2H-") equivalent. (C Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005).
The first Lewis acid-catalyzed trifluoromethylation reactions of aldehydes with Me3SiCF3 under TiF4/DMF, Ti(OiPr)4/DMF and Cu(OAc)2/dppp/toluene conditions are described. We have successfully applied this methodology to the difluoromethylation of aldehydes using Me3SiCF2SePh, Me3SiCF2P(O)OEt2 and Me3SiCF2SPh.
Nucleophilic difluoromethylation and difluoromethylenation using bromodifluoromethyl phenyl sulfone
作者:G.K. Surya Prakash、Ying Wang、Jinbo Hu、George A. Olah
DOI:10.1016/j.jfluchem.2005.07.011
日期:2005.10
found to be an effective electron-transfer agent that promoted the reactions of bromodifluoromethyl phenylsulfone with aldehydes to give structurally diverse (benzenesulfonyl)difluoromethylated alcohols in good yield, which can be further transformed into difluoromethyl alcohols and 1,1-difluoro-1-alkenes via reductive desulfonylation and Julia olefination, respectively.
Compounds of formula I:
are disclosed, as are pharmaceutical compositions containing such compounds. Methods of treating neurological or psychiatric diseases and disorders in a subject in need thereof are also disclosed.
式 I 的化合物:
以及含有此类化合物的药物组合物。还公开了治疗有需要的对象的神经或精神疾病和失调的方法。
Nucleophilic difluoromethylation of carbonyl compounds using TMSCF2SO2Ph and Mg0-mediated desulfonylation
作者:Chuanfa Ni、Jinbo Hu
DOI:10.1016/j.tetlet.2005.09.162
日期:2005.11
A new nucleophilic difluoromethylation chemistry using fluoride-induced (phenylsulfonyl)difluoromethylation with TMSCF2SO2Ph followed by the magnesium-metal-mediated desulfonylation has been achieved. This methodology is compatible with both enolizable and non-enolizable aldehydes and ketones and has special advantage in the case of enolizable aldehydes. The new efficient desulfonylation method is considered to be environmentally benign due to the absence of mercury. (c) 2005 Elsevier Ltd. All rights reserved.