The reaction of cis- or trans-5-isopropenyl-2-methyl-2-cyclohexenyl diethyl phosphate (I) with Me2AlX (X = OPh, SPh, NHPh) in hexane results in substitution of the -O-PO(OEt)2 group with X under predominant inversion. The solvent effects on the stereochemistry in these reactions have been disclosed.
NEW SYNTHETIC REACTIONS BASED ON 1-METHYL-2-FLUOROPYRIDINIUM SALTS. FACILE CONVERSION OF ALCOHOLS TO THIOALCOHOLS
作者:Ko Hojo、Hiroshi Yoshino、Teruaki Mukaiyama
DOI:10.1246/cl.1977.133
日期:1977.2.5
Facileconversion of alcohols to thioalcohols via thiolesters is described. The synthetic scheme involves (i) preparation of thiolesters (5) by the reaction of ethanethioate anion with 2-alkyloxypyridinium salts (3), formed from 1-methyl-2-fluoropyridinium salt (1) and alcohols, and (ii) subsequent reduction of 5 to thioalcohols. A clean inversion of configuration is noted.