An Efficient Synthesis of Stable Phosphorus Ylides Derived from Triphenylphosphine, Dialkyl Acetylenedicarboxylates, and an NH-Acid
作者:Malek Taher Maghsoodlou、Norollah Hazeri、Sayyed Mostafa Habibi Khorassani、Reza Heydari、Mahmoud Nassiri、Ghasem Marandi、Zohreh Moeeni、Uranous Niromand、Zahra Eskandari Torbaghan
DOI:10.1080/10426500500272111
日期:2006.4.1
Stable crystalline phosphorus ylides were obtained in excellent yields from the 1:1:1 addition reaction between triphenylphosphine and dialkyl acetylenedicarboxylates in the presence of strong NH-acids, such as benzotriazole, 5-methylbenzotriazole, 5-chlorobenzotriazole, pyrrole, 2-acetylpyrrole, pyrrole-2-carboxaldehyde, 4-nitro-acetanilide, 4-methoxyacetanilide, 4-bromoacetanilide, 4-methylacetanilide
在强 NH 酸(如苯并三唑、5-甲基苯并三唑、5-氯苯并三唑、吡咯、2-乙酰基吡咯)存在下,三苯基膦与乙炔二羧酸二烷基酯之间的 1:1:1 加成反应以优异的收率获得了稳定的结晶磷叶立德,吡咯-2-甲醛、4-硝基-乙酰苯胺、4-甲氧基乙酰苯胺、4-溴乙酰苯胺、4-甲基乙酰苯胺、2-甲基-乙酰苯胺和2,6-二甲基乙酰苯胺。这些稳定的叶立德作为两种几何异构体的混合物存在于溶液中,这是由于叶立德部分与相邻羰基的共轭导致围绕碳-碳部分双键的旋转受限。