Allylated ketosulphides of benzothiazole as intermediates for stereoselective synthesis of allyl ketones, allyl thiiranes and dienes
作者:Vincenzo Caló、Vito Fiandanese、Angelo Nacci、Angela Volpe
DOI:10.1016/0040-4020(95)01030-0
日期:1996.2
dichloromethane under mild conditions affording α- and α,α-diallylated ketosulphides 2 in high yields. Reductive desulphurization of 2a–d with tributyltin hydride gives diallylated ketones 3a–d, whereas reduction of mono-allylated 2e–k with sodium borohydride in isopropanol affords allyl episulphides 4e–k prevalently as (Z)-isomers which can be transformed stereoselectively into dienes.
在乙酸钯存在下于二氯甲烷中,在温和条件下,苯并噻唑1的α-酮硫化物与碳酸烯丙酯反应,以高收率得到α-和α,α-二烯丙基化的酮硫化物2。用氢化三丁基锡对2a-d进行还原性脱硫得到二烯丙基化的酮3a-d,而在异丙醇中用硼氢化钠还原单烯丙基化2e-k则得到烯丙基环氧乙烷4e-k,主要是(Z)-异构体,可以将其立体选择性地转化为二烯。