Enantioselective 1,3-Dipolar Cycloaddition Reaction between Diazoacetates and α-Substituted Acroleins: Total Synthesis of Manzacidin A
作者:Taichi Kano、Takuya Hashimoto、Keiji Maruoka
DOI:10.1021/ja056851u
日期:2006.2.1
A titanium BINOLate catalyzed asymmetric1,3-dipolarcycloaddition reaction between alpha-substituted acroleins and alkyl diazoacetates has been developed. With this methodology in hand, chiral 2-pyrazolines containing a quaternary stereogenic center were obtained in high to excellent enantioselectivities (up to 95% ee). The synthetic utility of the optically enriched 2-pyrazoline thus obtained was
An efficient synthetic method for stereoselective construction of asymmetric quaternary carbon stereocenters, bearingnitrogen in the form of Boc-protected allyl amines, has been developed. This methodology is employed in the synthesis of marine alkaloids, manzacidin A and C.