作者:Jos� Manuel Blanco、Olga Caama�o、Franco Fern�ndez、Isabel Nieto
DOI:10.1002/prac.199533701115
日期:——
Attempts to synthesize stereospecifically menthanethiol (2) and menthyl thiocyanate (3) from suitable electrophilic neomenthyl substrates (4a-c), and a variety of sulfur nucleophiles failed or predominantly led to beta-elimination products. Almost quantitative yields of mixtures of 2 and its 3-epimer (8) were obtained by reductive cleavage of (-)-3-menthone ethylene dithioacetal (7), but stereoselectivity was low (ratio of 2/8, 41:59) and the mixture could not be resolved. Recrystallization and subsequent oxidation of the dinitrophenyl sulfides of 2 and 8 allowed the isolation of the dinitrophenyl menthyl and neomenthyl sulfoxides (12 and 13, respectively), and an irresolvable mixture of the sulfones 14 and 15.