Intramolecular cyclization of alkylhydroxylamines in acids.
作者:MASAMI KAWASE、YASUO KIKUGAWA
DOI:10.1248/cpb.29.1615
日期:——
Alkylhydroxylamines having a benzene ring in the molecule were subjected to intramolecular cyclization in trifluoroacetic acid or in the presence of Lewis acids, and benzenefused six-membered heterocycles were obtained in moderate yields from the cyclization reaction of O-acylhydroxylamines. The effect of a methoxyl group on the benzene ring was also investigated. The m-methoxy compound (1j) cyclized to give 6-methoxy-2-methyl-1, 2, 3, 4-tetrahydroquinoline (2e), while the p-methoxy compound (1k or 1l) cyclized to give the same product (2e). These unusual results could be explained in terms of a spiro-intermediate (3a).
Phenoxyacetic acid derivatives and their use as herbicides
申请人:Rhone-Poulenc Agro
公开号:US06337306B1
公开(公告)日:2002-01-08
Phenoxyacetic acid derivatives of the formula:
wherein R1, R2, Xn and A are as defined herein, and a process for preparing the derivatives. The derivatives are used as herbicides.