Asymmetric Dipolar Cycloadditions of Me<sub>3</sub>SiCHN<sub>2</sub>. Synthesis of a Novel Class of Amino Acids: Azaprolines
作者:Michael R. Mish、Francisco M. Guerra、Erick M. Carreira
DOI:10.1021/ja971708p
日期:1997.9.1
Efficient Enantioselective Synthesis of Cα-Methyl Aspartic Acid and 3-Amino-3-methylpyrrolidin-2-one
作者:Hiroshi Sasaki、Erick M. Carreira
DOI:10.1055/s-2000-6240
日期:——
The asymmetric dipolar cycloaddition reaction of Me3SiCHN2 and auxiliary-bound methacrylate affords ready entry into optically active substituted pyrazolines. Herein we disclose an unusual alkaline fragmentation reaction of optically active pyrazoline 1 that affords an efficient synthesis of the pharmacologically important 2-methylaspartic acid in good yields. Additionally, in an alternative transformation of the pyrazoline (1), reductive cleavage provides the corresponding 3-amino-3-methylpyrrolidin-2-one.