Alkylation of the Sulfur- and Nitrogen-containing Compounds Analogous to Thiazoline Systems
作者:Yoshio Ohara、Kin-ya Akiba、Naoki Inamoto
DOI:10.1246/bcsj.56.1508
日期:1983.5
N,N-Dimethyl-2-(alkylthio)ethylamines and 3-methylthiazolidines underwent N-methylation both with trimethyloxonium tetrafluoroborate (3a) and with methyl iodide. In the methylation of N,N-dimethyl-o-(methylthio)aniline, the main reaction was S-methylation. On the other hand, in the o-ethylthio derivative, S-methylated product was major with methyl iodide, while N-methylated product was major with 3a
N,N-二甲基-2-(烷硫基)乙胺和 3-甲基噻唑烷与三甲基氧鎓四氟硼酸盐 (3a) 和甲基碘进行 N-甲基化。N,N-二甲基-邻-(甲硫基)苯胺甲基化反应的主要反应是S-甲基化。另一方面,在邻乙硫基衍生物中,S-甲基化产物以甲基碘为主,而N-甲基化产物以3a为主。在 N-乙基或 N-苄基衍生物中,两种试剂仅发生 S-甲基化。3-甲基-2, 2-二苯基-2,3-二氢-苯并噻唑得到带有 3a 的 S-甲基化产物,表明当 2-取代基体积较大时 S-甲基化变得主要。4-甲基-3,4-dmydro-2H-苯并[b][1,4]噻嗪在氮上用3a甲基化,同时用甲基碘得到S-甲基化产物。吩噻嗪和 1-二烷基氨基-8-(甲硫基)萘仅产生 S-甲基化产物。在 N-甲基化的情况下,选择性 S-甲基化是通过在氮原子上进行质子化,然后是甲基...