Enantiopure (3S,4R)- and (3S,4S)-3-amino-4-hydroxyhexanoic acids and (4S,5R)- and (4S,5S)-4-amino-5-hydroxyheptanoic acid derivatives have been prepared by stereodivergent synthesis from L-aspartic and L-glutamic acids, respectively. The stereochemistry at the carbon atom attached to the amino group was determined from the starting material, but the configuration at C-4 or C-5 is controlled by diastereoselective
Enantiopure (3S,4R)- 和 (3S,4S)-3-amino-4-hydroxyhexanoic 酸和 (4S,5R)- 和 (4S,5S)-4-amino-5-hydroxyheptanoic 酸衍
生物已通过立体发散法制备分别由
L-天冬氨酸和
L-谷氨酸合成。与
氨基相连的碳原子的立体
化学由起始材料确定,但 C-4 或 C-5 的构型由
二乙基锌或
乙基溴化镁的非对映选择性烷基化控制。作为 OBO 原酸酯的羧基保护提高了最终产品的产率。(© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)