Synthesis of substituted thiophenes and thiazolidines from 1-amino-2-benzoyl-2-(1-pyridinio)ethylene-1-thiolates
摘要:
It was found that alkylation of Z-isomers of 1-amino-2-benzoyl-2-(1-pyridinio)-ethylene-1-thiolate with phenacyl bromides proceeds regioselectively with formation of Z-isomers of bromides of 1-amino-2-benzoyl-2-(1-pyridinio)-1-phenacylthioethylenes, which are used in the synthesis of not easily accessible thiophenes and thiazolidines.
Stereoselectivity in the reactions of 1-phenacylpyridinium methylide with isothiocyanates: Molecular and crystal structure of 2-benzoyl-2-(1-pyridino)-1-phenylaminoethylene-1-thiolate
摘要:
The reaction of 1-phenacylpyridinium ylid with isothiocyanates proceeds stereoselectively with the formation of the Z isomers of 1-amino-2-benzoyl-2-(1-pyridino) ethylene-1-thiolates, whose configuration was unequivocally established by x-ray diffraction structural analysis. A strong intramolecular N-H ... O hydrogen bond and large number of short intra- and intermolecular contacts facilitate electrostatic stabilization of the molecular configuration found in the crystal.