Fluoride-ion induced desilylation of N-benzyl-N-methyl-N-(2-alkenyl)-N-[(trimethylsilyl)methyl]ammonium halides gave N-methylide intermediates which were isomerized to N-methyl-N-(2-alkenyl)-2-methylbenzylamines (Sommelet-Hauser rearrangement products) and N-methyl-N-(3-alkenyl)benzylamines (allyl rearrangement products) in DMF at room temperature.
Reaction of N,N-Dialkyl-N-(trimethylsilyl)methyl-.GAMMA.-substituted Allylammonium Salts with Cesium Fluoride.
作者:Chen ZHANG、Yasuhiro MAEDA、Yoshiro SATO
DOI:10.1248/cpb.46.572
日期:——
The reaction of N, N-dialkyl-N-(trimethylsilyl)methyl-γ-(methoxycarbonyl or cyano)allylammonium salts (1e, g, h) with cesium fluoride in N, N-dimethylformamide (DMF) did not form the expected allyl rearrangement products 3 of N-methylides 2, and instead gave N, N-dialkyl-3-(methoxycarbonyl or cyano)-2-(fluoromethyl)propylamines (9e, g, h) as the main product. The reaction mechanism is discussed.