作者:Rolf Huisgen、Grzegorz Mloston、Albert Pröbstl
DOI:10.1002/hc.1022
日期:——
Spiro[fenchane-2,2′-(1,3,4)-thiadiazoline] (6), prepared from thiofenchone and diazomethane, extrudes N2 (t1/2 22 min, 46°C, toluene) and furnishes the S-methylide 7 which, in turn, closes the thiirane ring or else is intercepted by 1,3-cycloadditions to dipolarophiles (tetracyanoethylene, maleic anhydride, N-methyl-1,2,4-triazoline-3,5-dione, aromatic thioketones). When thiocarbonyl S-methylide 7
Spiro[fenchane-2,2'-(1,3,4)-thiadiazoline] (6),由噻吩酮和重氮甲烷制备,挤出 N2(t1/2 22 分钟,46°C,甲苯)并提供 S-甲基化物7 依次关闭硫杂丙环或被 1,3-环加成与偶极体(四氰乙烯、马来酸酐、N-甲基-1,2,4-三唑啉-3,5-二酮、芳族硫酮)拦截。当硫代羰基 S-甲基化物 7 在甲醇中游离时,会形成腙酮 S,O-二甲基缩醛作为 HX 加合物。乙酸催化通过 Wagner-Meerwein 重排将 7 转化为 1-(甲硫基)-α-芴(25)。将重氮甲烷添加到硫樟脑中,通过噻二唑啉 12,生成硫樟脑 S-甲基化物;后者经历 1,4-H 位移,从而提供 2-甲硫基-2-冰片烯 (11)。© 2001 John Wiley & Sons, Inc. 杂原子化学 12:136–145, 2001