Potassium enolates of alkyl aryl ketones react selectively in DMSO with phenylazo 1a and 4-methylphenylazo tert-butyl sulfide 1b undergoing respectively effective α-phenylationvia SRN1 and α-(4-methylphenyl)hydrazonylation via elimination-addition.
1-Aryl-2-(p-tolylazo)alkenes were synthesized starting from alkyl arylketones in good overall yield. The employed three-step procedure involves: i) α-p-tolylhydrazonylation of ketone enolates with tert-butyl p-tolylazosulfide 1; ii) selective reduction of the carbonyl function of the obtained α-p-tolylhydrazono ketones 3 with NaBH4; iii) dehydration of the ensuing hydrazono alcohols 4 either in an
从烷基芳基酮开始以良好的总产率合成1-芳基-2-(对甲苯基)烯烃。所采用的三个步骤过程涉及:我)α - p与酮烯醇化物的-tolylhydrazonylation叔丁基p -tolylazosulfide 1 ; II)选择性还原所获得的羰基官能团的α - p -tolylhydrazono酮3用NaBH 4 ; iii)随后的肼基醇4以Et 2 O / dil脱水。H 2 SO 4 两相体系或在吡啶/乙酸酐中。