Palladium-catalyzed cycloaddition of carbon dioxide with methoxyallene
摘要:
A palladium catalyst generated from Pd2(dba)3.CHCl3 and (n)Bu2PCH2CH2Py (Py = 2-pyridyl) has effected novel cycloaddition of methoxyallene with CO2 to afford (E)-5-methoxy-2-(methoxy-methylene)-4-methylene-5-pentanolide regio- and stereospecifically, where a methoxy functional group plays an important role.