2-thiophene 12 was carboxylated using butyllithium and carbon dioxide to give 5-thiophene-2-carboxylic acid 13.Conversion of the acid 13 using diphenyl phosphazidate and triethylamine gave 5-4-(1,
Axton, Christopher A.,Billingham, Michael E. J.,Bishop, Paul M.,Gallagher, Peter T.,Hicks, Terence A.,et al.
p. 2203 - 2214
(2007/10/02)
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