A variety of 3-diphenylphosphoryl- and 3-diethoxyphosphoryl-(aza)isoindolinones have been efficiently prepared by aryne- and hetaryne-mediated cyclization of phosphorylated α-amino carbanions derived from suitably substituted 2- and 3-halobenamide and 3-chloropyridine-4-carboxamide derivatives. The synthesis of some 3-sulfonylated analogs by extension of this principle has been achieved.
SmI2-promoted tandem desulfurization and reductive coupling reactions of aromatic lactams with carbonyl compounds
作者:Hidemi Yoda、Yasuaki Ujihara、Kunihiko Takabe
DOI:10.1016/s0040-4039(01)02030-5
日期:2001.12
aromatic lactams with carbonylcompounds in the presence of samarium(II) diiodide was found to undergo novel tandem desulfurization and reductive couplingreactions to generate α-hydroxyalkylated lactams in high yield. Stereochemistry of the coupling products was researched and the results that decreasing the steric bulkiness of the N-substituents as well as raising the reaction temperature leads to