Diazoverbindungen. 72. (Diazoalkyl)phosphane - Synthese durch elektrophile Diazoalkansubstitution und oxidative Additionsreaktionen am Phosphor
摘要:
Electrophilic diazoalkane substitution of the diazomethyl compounds lab with the chloro phosphanes 2a-o in the presence of lithium diethylamide yields the diazoalkyl phosphanes 3a-z. Oxidative addition of oxygen, sulfur and selenium at phosphorus leads into the series of oxo, thioxo and selenoxo phosphanes having diazoalkyl substituents (4a-d, 5a-m and 7a-d). The silyl group of 5n,o is cleaved by chromatography on aluminium oxide to yield the (diazomethyl)phosphane sulfides 6a,b.
Reaction of C-Silylated α-Diazophosphines as Nucleophiles toward Carbonyl Compounds: A Mechanistic Study and Application to the Synthesis of Alkynes and α-Hydroxyphosphonamides
作者:Ona Illa、Xavier Bagan、Anna M. Cazorla、Céline Lyon、Antoine Baceiredo、Vicenç Branchadell、Rosa M. Ortuño
DOI:10.1021/jo060663k
日期:2006.7.1
α-hydroxyphosphonamides and alkynes have been efficiently synthesized through the reaction of C-silylated α-diazophosphines with different types of aldehydes (2 equiv) in a neutral medium under very mild conditions. The reaction with some chiral aldehydes is highly diastereoselective leading to phosphonamides as single diastereomers. The novel reaction is influenced by electronic and steric effects being precluded for
Electrophilic diazoalkane substitution of the diazomethyl compounds lab with the chloro phosphanes 2a-o in the presence of lithium diethylamide yields the diazoalkyl phosphanes 3a-z. Oxidative addition of oxygen, sulfur and selenium at phosphorus leads into the series of oxo, thioxo and selenoxo phosphanes having diazoalkyl substituents (4a-d, 5a-m and 7a-d). The silyl group of 5n,o is cleaved by chromatography on aluminium oxide to yield the (diazomethyl)phosphane sulfides 6a,b.