Reactions of Sulfoxides with Magnesium Amides. Transformation of Sulfoxides into Sulfides, Dithioacetals, and Vinyl Sulfides
作者:Kazuhiro Kobayashi、Masataka Kawakita、Kouichi Yokota、Tohru Mannami、Koji Yamamoto、Osamu Morikawa、Hisatoshi Konishi
DOI:10.1246/bcsj.68.1401
日期:1995.5
ethylmagnesium bromide and secondary amines, such as diisopropylamine (DIPA) or 2,2,6,6-tetramethylpiperidine (TMP) in diethyl ether, were examined. Diaryl sulfoxides were heated with the diisopropylaminomagnesium reagent in diethyl ether to give the corresponding diaryl sulfides in 42—52% yields. Sulfoxides bearing hydrogens at the α-positon only (RSOCH2R1) reacted with the tetramethylpiperidinomagnesium
研究了亚砜与由溴化乙基镁和仲胺(例如二异丙胺 (DIPA) 或 2,2,6,6-四甲基哌啶 (TMP) 在乙醚中的反应)原位生成的氨基镁的反应。二芳基亚砜与二异丙基氨基镁试剂在乙醚中一起加热,得到相应的二芳基硫化物,产率为 42-52%。仅在 α 位带有氢的亚砜 (RSOCH2R1) 在室温下与四甲基哌啶镁试剂反应,生成相应的二硫缩醛 (RSCHR1SR),产率为 47-86%。在室温下用氨基镁处理在 α 位和 β 位都带有氢的亚砜 (RSOCHR1CHR2R3) 得到相应的乙烯基硫化物 (RSCR1=CR2R3),产率为 52-72%,伴随着 2。3-27% 的相应二硫代缩醛的产率。讨论了导致形成硫稳定碳正离子中间体的产物的途径。