Ring-enlargement of Methoxynaphthalenes with Dichlorocarbene to Benzotropone Derivatives
作者:Masaru Sato、Josuke Tsunetsugu、Seiji Ebine
DOI:10.1246/bcsj.49.2230
日期:1976.8
The dichlorocarbene addition to various di- and trimethoxynaphthalenes has been investigated systematically. It has been found that the carbene addition is oriented by the 1-methoxyl group to the 3,4-double bond and by the 2-methoxyl group to the 1,2-double bond of naphthalene nucleus, and that the spontaneous cyclopropane ring-opening of the intermediate carbene-adducts leads to the preferencial formation
已经系统地研究了二氯卡宾加成到各种二甲氧基萘和三甲氧基萘中。已经发现卡宾加成由 1-甲氧基定向到 3,4-双键,2-甲氧基定向到萘核的 1,2-双键,并且自发环丙烷环-中间体卡宾加合物的开环导致 2,3-苯甲酮比 4,5-苯甲酮衍生物优先形成。甲氧基的空间效应在卡宾加成或开环反应中似乎都不显着。