Synthesis of 2,3-disubstituted thiophens via metalated acetylenes and allenes
作者:R.L.P. De Jong、L. Brandsma
DOI:10.1016/s0022-328x(00)87040-0
日期:1982.11
2,3-Disubstituted thiophen derivatives have been obtained in reasonable yields by treating 2-alkyne- and allene derivatives with butyllithium and potassium t-butoxide in tetrahydrofuran, adding carbon disulfide to the organometallic intermediate and then successively adding t-butyl alcohol, hexamethyl-phosphoric triamide and methyl iodide.
A New Versatile Synthesis of 2,5-Disubstituted 3-(Methylsulfanyl)thiophenes
作者:Claudia Fattuoni、Michele Usai、Enzo Cadoni、M. Cabiddu、Stefania De Montis、Salvatore Cabiddu
DOI:10.1055/s-2008-1032190
日期:2008.3
A one-pot regioselective functionalization of 3-(methyl- sulfanyl)thiophene with different electrophiles at the 2- and 5-posi- tions is reported. Proper selection of the experimental conditions allows the preparation of polysubstituted products not otherwise easily available.