Fluorine as an ortho-directing group in aromatic metalation: A two step preparation of substituted benzo[b]thiophene-2-carboxylates
作者:Alexander J. Bridges、Arthur Lee、Emmanuel C. Maduakor、C.Eric Schwartz
DOI:10.1016/s0040-4039(00)60806-7
日期:——
A simple 2-step synthesis of B-ring substituted benzo[b]thiophene-2-carboxylates from aryl fluorides has been developed. The route involves a selective lithiation ortho to fluorine, followed by formylation, and subsequently, displacement of fluorine with thioglycollate and base-induced ring closure in a single operation.
已经开发了由芳基氟化物简单地两步合成B环取代的苯并[b]噻吩-2-羧酸酯的方法。该路线涉及对氟的邻位选择性锂化,然后进行甲酰化,随后在一次操作中用硫代乙醇酸酯置换氟并进行碱诱导的闭环。