Treatment of N-arylimino-1,2,3-dithiazoles 2 with
ethylmagnesium bromide (2 equiv.) gives the corresponding aryl
isothiocyanates 13, providing a very mild two-step conversion of
ArNH
2
into ArNCS avoiding hazardous reagents; alternatively the
iminodithiazoles 2 can be converted into cyanothioformanilides 11 which
rapidly give the same isothiocyanates with 1 equiv. of the Grignard
reagent.
用
溴化乙基
镁(2当量)处理N-芳基
亚胺-1,2,3-
硫二唑2,可以得到相应的芳基异
硫氰酸酯13,提供了一种非常温和的两步反应,将ArNH₂转化为Ar
NCS,避免了使用有害试剂;另外,
亚胺硫二唑2还可以转化为
氰硫酰胺11,这些化合物与1当量的
格氏试剂迅速生成相同的异
硫氰酸酯。