Zinc-copper(I) chloride or -silver(I) acetate promoted aldol reaction of chlorodifluoromethyl ketones with carbonyl compounds. A general and effective route to α,α-difuluoro-β-hydroxy ketones
作者:Manabu Kuroboshi、Takashi Ishihara
DOI:10.1016/s0040-4039(00)96894-1
日期:1987.1
Chlorodifluoromethyl ketones efficiently underwent the aldol reaction with a variety of aldehydes or ketones in the presence of zinc, a catalytic amount of copper(I) chloride or silver(I) acetate and molecular sieves to give the corresponding α,α-difluoro-β-hydroxy ketones in good to excellent yields.
A convenient synthesis of 2,2-difluoro enol silyl ethers from chlorodifluoromethyl ketones
作者:Masayuki Yamana、Takashi Ishihara、Teiichi Ando
DOI:10.1016/s0040-4039(00)81449-5
日期:——
Various chlorodifluoromethyl ketones can be converted to the corresponding 2,2-difluoro enol silylethers in good yields, by the action of zinc dust and chlorotrimethylsilane in dry acetonitrile at 60°C.
NEW LOW-VALENT TITANIUM CATALYZED REACTION OF CHLORODIFLUOROMETHYL KETONES LEADING TO α,α-DIFLUORINATED β-HYDROXY KETONES
作者:Takashi Ishihara、Tohru Yamanaka、Teiichi Ando
DOI:10.1246/cl.1984.1165
日期:1984.7.5
Various chlorodifluoromethyl ketones underwent the aldol-type reaction with aldehydes or ketones by the action of titaniumtetrachloride and zinc reagent in tetrahydrofuran at room temperature to give moderate to good yields of α,α-difluorinated β-hydroxy ketones.
Selective preparation of 1-substituted 2,2-difluoroethenyl phosphates or 1-hydroxyalkanephosphonates through the reaction of chlorodifluoromethyl ketones with dialkyl or diaryl phosphites
Various chlorodifluoromethyl ketones react readily with dialkyl or diaryl phosphites in the presence of triethylamine at the reflux temperature of tetrahydrofuran to give the corresponding dialkyl or diaryl 1-substituted-2,2-difluoroethenyl phosphates in good yields, whereas the similar reaction conducted at lower temperature (0-20 °C) affords 1-(chlorodifluoromethyl)-1-hydroxyalkanephosphonates almost