Highly Regioselective One‐Pot Synthesis of 7‐Hydroxy‐6‐methylphthalide from 3‐Hydroxy‐4‐methylbenzylalcohol
作者:Meili Duan、Michael D. Toney
DOI:10.1080/00397910500297214
日期:2005.11
Abstract 7‐Hydroxy‐6‐methylphthalide 2 was synthesized with high regioselectivity and moderate yield using a novel one‐pot synthesis that employed 3‐hydroxy‐4‐methylbenzylalcohol 1 and formaldehyde in the presence of tin(IV) chloride as catalyst and triethylamine as base. The proposed mechanism of the formation of 2 involves ortho‐formylation followed by hemiacetal formation and oxidation.
摘要 7-Hydroxy-6-methylphthalide 2 在氯化锡(IV)作为催化剂和三乙胺作为催化剂存在下,使用 3-羟基-4-甲基苄醇 1 和甲醛的新型一锅法合成,具有高区域选择性和中等收率。根据。所提出的 2 形成机制包括原甲酰化,然后是半缩醛的形成和氧化。