Waste-Free Catalytic Propargylation/Allenylation of Aryl and Heteroaryl Nucleophiles and Synthesis of Naphthopyrans
作者:J. McCubbin、Costa Nassar、Oleg Krokhin
DOI:10.1055/s-0030-1260146
日期:2011.10
pyrroles, as well as methoxy-substituted benzenes and naphthalenes. Reaction with 2-naphthol affords substituted naphthopyrans as products. Preliminary evidence suggests a Friedel-Crafts-like substitution mechanism, which occurs via an in situ generated carbocation. organocatalysis - boronic acids - propargylic alcohols - Friedel-Crafts reaction
已经开发了用富电子芳族碳环和杂环取代炔丙醇的通用方法。该反应在简单,温和的条件下进行,并使用廉价的环境友好且可回收的芳基硼酸催化剂全氟苯基硼酸,产生水作为唯一的副产物。对于炔丙基或烯丙基取代的产物,包括呋喃,吲哚和吡咯,以及甲氧基取代的苯和萘,观察到高收率和选择性。与2-萘酚反应得到取代的萘并吡喃类产物。初步证据表明,Friedel-Crafts样取代机制是通过原位生成的碳正离子发生的。 有机催化-硼酸-炔丙醇-Friedel-Crafts反应