作者:Ramon J. Alabaster、Ian F. Cottrell、Hugh Marley、Stanley H. B. Wright
DOI:10.1055/s-1988-27762
日期:——
The preparation of 2,3-dihydrobenzofurans 6 from 2-(2-bromophenoxy)ethyl chlorides 3 by reaction with magnesium in a development of the Parham cyclialkylation reaction is described. A high yielding procedure using phase-transfer catalysis has also been developed for the preparation of the intermediate chloroethyl ethers 3 from bromophenols 2. The 5-hydroxy derivative 15 may be obtained from 2,3 dihydrobenzofuran (6a) by reaction with electrophilic reagents followed by oxidation.
本文描述了从2-(2-溴苯氧基)乙基氯化物3通过与镁反应生成2,3-二氢苯并呋喃6的Parham环烷基化反应的制备过程。还开发了一种使用相转移催化的高产率方法,用于从溴苯酚2制备中间体氯乙基醚3。通过与亲电试剂反应后进行氧化,可以从2,3-二氢苯并呋喃(6a)获得5-羟基衍生物15。