From ketones, aldehydes or alkyl halides to terminal 1,1-difluoroolefins using BrF3
摘要:
Terminal difluoromethylenes were prepared by two different routes: (a) by treating ketones and aldehydes with bis(methylthio)methane, producing 2-alkyl-1,1-bis(methylthio)alkene (2) (b) reacting alkyl halides with tris(methylthio)methane forming 1-alkyl-1,1,1-tris(methylthio)alkane derivatives (7). The reaction of either 2 or 7 with BrF3, followed by oxidation with (HOFCH3CN)-C-. gave the difluorosulfonyl derivatives 4. Consecutive treatment with Zn led to the target difluoroolefins (5) in overall yields of 60-75%. (c) 2005 Elsevier B.V All rights reserved.
From Alkyl Halides to Alkyltrifluoromethyls Using Bromine Trifluoride
作者:Aviv Hagooly、Iris Ben-David、Shlomo Rozen
DOI:10.1021/jo026128b
日期:2002.11.1
right conditions, bromine trifluoride can be a useful tool for generating new types of reactions and compounds. Thus, tris(methylthio)alkyl derivatives, easily prepared from the corresponding alkyl bromides, were converted to the corresponding RCHBrCF2SMe or RCHBrCF3 compounds. The bromine atom, however, could be easily reduced forming eventually R'CF2SMe or R'CF3. If desired, the bromine atom can serve
From ketones, aldehydes or alkyl halides to terminal 1,1-difluoroolefins using BrF3
作者:Aviv Hagooly、Shlomo Rozen
DOI:10.1016/j.jfluchem.2005.06.003
日期:2005.8
Terminal difluoromethylenes were prepared by two different routes: (a) by treating ketones and aldehydes with bis(methylthio)methane, producing 2-alkyl-1,1-bis(methylthio)alkene (2) (b) reacting alkyl halides with tris(methylthio)methane forming 1-alkyl-1,1,1-tris(methylthio)alkane derivatives (7). The reaction of either 2 or 7 with BrF3, followed by oxidation with (HOFCH3CN)-C-. gave the difluorosulfonyl derivatives 4. Consecutive treatment with Zn led to the target difluoroolefins (5) in overall yields of 60-75%. (c) 2005 Elsevier B.V All rights reserved.