Thiocarbonyl Ylides. Attempted Preparation and Related Reactions
作者:Shuichi Mitamura、Masaaki Takaku、Hitosi Nozaki
DOI:10.1246/bcsj.47.3152
日期:1974.12
The attempted preparation of thiocarbonyl ylides (I) by the proton abstraction of thiouronium salts (III) has disclosed a fast isomerization of I to enethiols (V) (Y=H) and an alternative desulfurization to enediamines (VII) (Y=Ph), the by-products being olefins (VIII) and sulfides (IX). The second route to I examined consists of the reaction of tetramethylthiourea (II) with diazomalonate, which gives
通过硫脲鎓盐 (III) 的质子提取来尝试制备硫代羰基叶立德 (I) 公开了 I 快速异构化为烯硫醇 (V) (Y = H) 和替代脱硫为烯二胺 (VII) (Y = Ph) ,副产物是烯烃 (VIII) 和硫化物 (IX)。第二种途径 I 包括四甲基硫脲 (II) 与重氮丙二酸酯的反应,生成烯二胺 (VIIg)。基于红外和核磁共振光谱讨论了烯二胺的 C=C 键的旋转。
Die Addition von Nucleophilen an Alkinderivate mit Push-pull-Gruppen
The preparative aspects of the addition of nucleophiles to alkyne-derivatives having both push- and pull-groups (1) are discussed: The addition of primary and secondary amines as well of aliphatic alcohols to the alkyne-derivatives 1 in most cases predominantly yields the Michael-adducts 2–10. The importance of a side-reaction consisting in an addition of amines to C(2) of the alkyne-derivatives 1