Transformation de l'hexafluoropropène en alcool trifluoroallylique, précurseur des α-fluoroacrylates
摘要:
The alpha-fluoroacryloyl fluoride precursor of alpha-fluoroacrylic acid esters can arise from an allylic transposition of trifluoroallylic alcohol of which two methods of preparation are presented. In the first, dehydrofluoration of the alcohol CF3CFHCH(3)OH (4) is used. This alcohol is generated from the ester CF3CFHCOOC2H5 (3). In the second, dehalogenation of the alcohol CF3CFBrCH2OH (10) by zinc is used. The latter is formed by the selective reduction of the ester CF(3)CFBrCOOC2H(5) (9).
Transformation de l'hexafluoropropène en alcool trifluoroallylique, précurseur des α-fluoroacrylates
摘要:
The alpha-fluoroacryloyl fluoride precursor of alpha-fluoroacrylic acid esters can arise from an allylic transposition of trifluoroallylic alcohol of which two methods of preparation are presented. In the first, dehydrofluoration of the alcohol CF3CFHCH(3)OH (4) is used. This alcohol is generated from the ester CF3CFHCOOC2H5 (3). In the second, dehalogenation of the alcohol CF3CFBrCH2OH (10) by zinc is used. The latter is formed by the selective reduction of the ester CF(3)CFBrCOOC2H(5) (9).
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‐Selective Palladium‐Catalyzed C−H Difluoroalkylation by Weak Oxazolidinone Assistance
作者:Xinyue Fang、Yuqiang Tan、Linghui Gu、Lutz Ackermann、Wenbo Ma
DOI:10.1002/cctc.202002056
日期:2021.4.9
Herein, we report a general and efficient method for the palladium‐catalyzed remote C(sp2)−Hdifluoroalkylation of N‐aryloxazolidinone derivatives with commercially available difluoroalkylbromide. This method tolerates a wide range of functional groups with 26 examples in up to 96 % yields. Moreover, it proceeds with complete para‐selectivity. Preliminary mechanistic studies indicated that a single
The construction of C(sp3)–C(sp3) bonds remains one of the most difficult challenges in cross-coupling chemistry. Here, we report a photoredox/nickel dual catalytic approach that enables the simultaneous formation of two C(sp3)–C(sp3) linkages via trimolecular cross-coupling of alkenes with alkyl halides and hypervalent iodine-based reagents. The reaction harnesses a bimolecular homolytic substitution