Regio- and Chemoselective Synthesis of Fully Substituted Thiophenes
作者:Fabian M. Piller、Paul Knochel
DOI:10.1021/ol802513q
日期:2009.1.15
A full functionalization of all four positions of the thiophene ring was achieved. Starting from readily available 2,5-dichlorothiophene, successive magnesiations of the 3- and 4-positions using TMPMgCl·LiCl furnish, after trapping with various electrophiles, 3,4-difunctionalized dichlorothiophenes. Subsequent dechlorination and metalation or magnesium insertion into the C−Cl bond provides fully functionalized