V. Dhayalan, Fernando Rabasa Alcañiz, V. Werner
Sep 2, 2015
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Synthesis
Abstract
3-Thienylacetic acid was converted in six steps into a new spirobi[thieno[2,3- c ]pyran] (overall yield: 52%). The spirobi[thieno[2,3- c ]pyran] was selectively mono- or dimetalated with butyllithium and then transmetalated with zinc chloride; cross-coupling reaction with various aryl or heteroaryl bromides, including bromo-oligothiophenes, acid chlorides, and 1-bromopyrene, produced the corresponding spiro derivatives in high yields.