申请人:Nihon Medi-Physics Co., Ltd.
公开号:US06486323B1
公开(公告)日:2002-11-26
An optically active tropinonemonocarboxylic acid ester derivative useful as an intermediate for synthesis of optically active tropane derivatives was obtained by reacting succindialdehyde with an organic amine and acetonedicarboxylic acid ester to obtain a tropinonedicarboxylic acid ester derivative, and then subjecting this derivative to enzyme-catalyzed asymmetric dealkoxy-carbonylation. Since anhydroecgonine methyl ester derived from the optically active tropinone-monocarboxylic acid ester derivative by reduction and dehydration had the same direction of optical rotation as in the case of anhydroecgonine methyl ester obtained from natural cocaine, it was proved that the obtained optically active tropinonemonocarboxylic acid ester derivative had the same absolute configuration as that of natural cocaine. The yield of the optically active tropinonemonocarboxylic acid ester derivative from the asymmetric dealkoxycarbonylation was 30 to 50 mol %, and its optical purity was 70 to 97% ee. In addition, it was found that a crystalline optically active anhydroecgonine carboxylic acid ester derivative can be obtained by reducing and then dehydrating the optically active tropinonemonocarboxylic acid ester derivative and that its optical purity can easily be increased by recrystallization.
通过将琥珀醛与有机胺和乙二酸二甲酯反应,得到了一种具有光学活性的环戊酮单羧酸酯衍生物,可用作合成具有光学活性的托帕甲基衍生物的中间体。然后将这种衍生物经过酶催化的不对称去烷氧羰基化,得到了一种环戊酮二羧酸酯衍生物。由于通过还原和脱水得到的光学活性环戊酮单羧酸酯衍生物衍生的无水异恶康宁甲酯的旋光方向与从天然可卡因中获得的无水异恶康宁甲酯相同,证明所得的光学活性环戊酮单羧酸酯衍生物具有与天然可卡因相同的绝对构型。从不对称去烷氧羰基化中得到的光学活性环戊酮单羧酸酯衍生物的产率为30至50摩尔%,其光学纯度为70至97%ee。此外,发现可以通过还原然后脱水光学活性环戊酮单羧酸酯衍生物,得到结晶的光学活性无水异恶康宁羧酸酯衍生物,并且通过再结晶可以轻松提高其光学纯度。