Total syntheses of clavine alkaloids by an intramolecular nitrone-olefin cycloaddition reaction
作者:W. Oppolzer、J.I. Grayson、H. Wegmann、M. Urrea
DOI:10.1016/s0040-4020(01)88608-7
日期:——
costaclavine (6), via the same isoxazolidine 18 are described. The key step 16→18 (Scheme 4) involves a transient nitrone 17 which undergoes a kinetically controlled, regio- and stereoselective intramolecularcycloaddition to a 1,2-disubstituted olefinic bond.