Syntheses of 1,2-N-alkylimino-1,2,3,4-tetrahydronaphthalene derivatives and preparation of ring closed analog of salbutamol as a new .BETA.-adrenoceptor agent.
作者:HIROSADA SUGIHARA、KIYOSHI UKAWA、AKIO MIYAKE、KATSUMI ITOH、YASUSHI SANNO
DOI:10.1248/cpb.26.394
日期:——
A method for preparing 5-substituted 2-tertiary-alkylamino-6-hydroxy-1, 2, 3, 4-tetrahydro-1-naphthalenols was described. The method involves the preparation of 1-alkylamino-2-hydroxy-1, 2, 3, 4-tetrahydronaphthalenes from 2-bromo-1-hydroxy derivatives via 1, 2-epoxides followed by the transposition of 1-alkylamino and 2-hydroxy groups via the ring closure to 1, 2-aziridines. Formation of the epoxides and aziridines and the reaction of epoxides with amines were examined in detail. The ring-opening reaction of epoxides was regioselective and the attacking position of a nucleophile was not affected by the electronic effects of substituents on the benzene ring. Cyclization into aziridine rings was best accomplished by the Wenker method using a sulfur trioxide-triethylamine adduct as the sulfating agent. Using our process, trans-2-tert-butylamino-6-hydroxy-5-hydroxymethyl-1, 2, 3, 4-tetrahydro-1-naphthalenol (70) was synthesized as conformationally fixed analog of salbutamol.
描述了一种制备5-取代2-叔烷基氨基-6-羟基-1,2,3,4-四氢-1-萘酚的方法。该方法包括由2-溴-1-羟基衍生物通过1, 2-环氧化物制备1-烷基氨基-2-羟基-1,2,3,4-四氢萘,然后将1-烷基氨基和2-羟基转位基团通过闭环形成1, 2-氮丙啶。详细研究了环氧化物和氮丙啶的形成以及环氧化物与胺的反应。环氧化物的开环反应具有区域选择性,亲核试剂的攻击位置不受苯环上取代基的电子效应影响。环化成氮丙啶环最好通过 Wenker 方法使用三氧化硫-三乙胺加合物作为硫酸化剂来完成。使用我们的方法,合成了反式-2-叔丁基氨基-6-羟基-5-羟甲基-1,2,3,4-四氢-1-萘酚 (70),作为沙丁胺醇的构象固定类似物。