A Convenient and Unambiguous Synthesis of 2 (or 7)-Chloronaphthalenes from Substituted α-Tetralones
作者:John D. Prugh、Albert A. Deana、J. Mark Wiggins
DOI:10.1055/s-1989-27317
日期:——
2(or 7)-Chlornaphthalenes are unambiguously prepared from α-tetralones(1-oxo-1,2,3,4-tetrahydronaphthalenes) by introducing two chlorines in the 2-position with sulfuryl chloride, reducing the ketone with sodium borohydride, and then converting the resulting hydroxy to chloro with thionyl chloride. Vicinal chlorines are then removed with activated zinc giving a vinyl chloride which is aromatized with 2,3-dichloro-4,5-dicyano-1,4-benzoquinone (DDQ) to give the desired 2(or 7)-chloronaphthalenes.
2(或 7)-氯萘(2(或 7)-Chlornaphthalenes)是由δ-四氢萘酮(1-氧代-1,2,3,4-四氢萘)制备而成的,制备方法是在 2-位用硫酰氯引入两个氯,用硼氢化钠还原酮,然后用亚硫酰氯将生成的羟基转化为氯。然后用活性锌除去副氯,得到氯乙烯,再用 2,3-二氯-4,5-二氰基-1,4-苯醌(DDQ)进行芳香化,得到所需的 2(或 7)-氯萘。