obtained exclusively and stereoselectively in fair yields by treating the 3-N-acylamino alcohols 5−8 with an equimolar amount of Lawesson’s reagent (LR), while the corresponding thiols 9−12 were afforded stereoselectively when only 0.5 equiv. of LR was used in this reaction.
4H-5,6-二氢-
1,3-噻嗪衍
生物 13-15 是通过用等摩尔量的
劳森试剂 (LR) 处理 3-N-酰基
氨基醇 5-8 以合理的收率独家和立体选择性地获得的,而当只有 0.5 当量时,相应的
硫醇 9-12 被立体选择性地提供。LR 用于该反应。