Rhodium(ii)-mediated reactions of thiobenzoylketene S,N-acetals with α-diazo carbonyl compounds: synthesis of 2-substituted 3-alkylamino-5-phenylthiophenes
Polozov, Alexander M.; Mustaphin, Albert H.; Khotinen, Alexander V., Phosphorus, Sulfur and Silicon and the Related Elements, 1992, vol. 73, # 1-4, p. 153 - 160
作者:Polozov, Alexander M.、Mustaphin, Albert H.、Khotinen, Alexander V.
Rhodium(<scp>ii</scp>)-mediated reactions of thiobenzoylketene S,N-acetals with α-diazo carbonyl compounds: synthesis of 2-substituted 3-alkylamino-5-phenylthiophenes
作者:Hyun Min Song、Kyongtae Kim
DOI:10.1039/b203931a
日期:——
Treatment of 3-methylamino-3-methylsulfanyl-1-phenylpropenethione 1 with excess (2.5 equiv.)
α-diazo carbonyl compounds such as α-diazoketones and α-diazoesters in the presence of a catalytic amount of Rh(II) acetate in CH2Cl2 at rt gave 2-acyl- or 2-aroyl-3-methylamino-5-phenylthiophenes and alkyl 3-methylamino-5-phenylthiophene-2-carboxylates, respectively, as major products along with 1-phenyl-2-methylsulfanylethanones. The formation of the major products indicates that the carbenes or carbenoids generated interact initially with the thione sulfur of 1.