Nucleophilic substitution reactions of difluorormethyl phenyl sulfone with alkyl halides leading to the facile synthesis of terminal 1,1-difluoro-1-alkenes and difluoromethylalkanes
申请人:Prakash Surya G. K.
公开号:US20060052643A1
公开(公告)日:2006-03-09
(Benzenesulfonyl)difluoromethyl anion, in situ generated from difluoromethyl phenyl sulfone and a base, was found to easily undergo nucleophilic substitution reactions (S
N
2) with primary alkyl halides, elemental halogens, and perfluoroalkyl halides with good selectivity. The formed (benzenesufonyl)difluoromethylalkanes are useful intermediates for the facile preparation of 1,1-difluoro-1-alkenes and difluorometbylalkanes. Thus, difluoromethyl phenyl sulfone acts as both “CF
2
═” and “CF
2
H
−
” synthons.
从二氟甲基苯磺酰酸和碱生成的(Benzenesulfonyl)difluoromethyl阴离子,在原位生成后,被发现容易与一级烷基卤化物、元素卤素和全氟烷基卤化物发生亲核取代反应(SN2),具有良好的选择性。形成的(苯磺酰基)二氟甲基烷烃是制备1,1-二氟-1-烯和二氟甲基烷烃的方便中间体。因此,二氟甲基苯磺酰酸同时作为“CF2═”和“CF2H−”合成子。