A process for preparing a compound of formula (ii),
(2R, 3S) comprising
(a) treating a compound of formula (i) with H2 and a platinum oxide catalyst under reducing conditions; and
(b) subjecting the product of step (a) to resolution with di-toluoyl-L-tartaric acid to provide compound (ii) in about 97% enantiomeric excess.
一种制备式(ii)化合物的工艺、
(2R,3S)的工艺,包括
(a) 在还原条件下,用 H2 和
氧化铂催化剂处理式(i)化合物;和
(b) 将步骤(a)的产物与二-甲基苯甲酰-
L-酒石酸进行解析,得到对映体过量率约为 97% 的化合物 (ii)。