The instability of carbamate-protected alkyl imines has greatly hampered the development of catalytic asymmetric Mannich reactions suitable for the synthesis of optically active carbamate-protected chiral alkyl amines. A highly enantioselective Mannich reaction with in situ generation of carbamate-protected imines from stable α-amido sulfones catalyzed by an organic catalyst has been developed. This reaction provides a concise and highly enantioselective route converting aromatic and aliphatic aldehydes into optically active aryl and alkyl β-amino acids.
羰酸酯保护的烷基
亚胺的不稳定性大大阻碍了催化不对称Mannich反应的发展,该反应适用于合成光学活性的羰酸酯保护的手性烷基胺。已经开发出一种有机催化剂催化的高对映选择性Mannich反应,该反应从稳定的α-
氨基磺酸盐中原位生成羰酸酯保护的
亚胺。该反应提供了一种简洁而高度对映选择性的途径,将芳香族和脂肪族醛转化为光学活性的芳基和烷基β-
氨基酸。