A novel method for the generation of 2,3-naphthoquinodimethanes utilizing samarium(II) iodide-promoted allene synthesis
作者:Junji Inanaga、Yuichi Sugimoto、Takeshi Hanamoto
DOI:10.1016/s0040-4039(00)60926-7
日期:1992.11
2,3-Naphthoquinodimethanes are easily generated from o-bis(α-acetoxypropargyl)benzene derivatives with SmI2 in the presence of palladium catalyst under mild conditions. The reactions of the quinodimethane intermediates were found to follow the different paths depending on the acetylenic substituents of substrates.
Intramolecular propargylic amination of propargylic acetates bearing an amino group at the suitable position in the presence of chiral copper–pybox complexes proceeds enantioselectively to give optically active 1-ethynyl-isoindolines (up to 98% ee).