A process for the asymmetric preparation of a compound of the formula ##STR1## wherein the hydrogen at 3a and 7a are of cis or trans configuration and their non-toxic, pharmaceutically acceptable acid addition salts comprising submitting a compound of the formula ##STR2## to a Hoffman reaction and reacting the resulting product with formaldehyde in the presence of cyanide ions and acid halide of benzoic acid or an aliphatic carboxylic acid of 1 to 5 carbon atoms to obtain a compound of the formula ##STR3## wherein R is acyl of benzoic acid or aliphatic carboxylic acid of 1 to 5 carbon atoms, cyclizing the latter to form a compound of the formula ##STR4## selectively hydrolyzing the latter with a dilute aqueous mineral acid to obtain a compound of the formula ##STR5## subjecting the latter to hydrolysis with a concentrated aqueous mineral acid to form the acid addition salt of a compound of claim 1 and optionally forming the free base.
一种用于不对称制备式为## STR1 ##的化合物的过程,其中3a和7a处的氢原子为顺式或反式构型,其非毒性、药学上可接受的酸盐包括将式为## STR2 ##的化合物提交给霍夫曼反应,并在
氰离子和
苯甲酸或1至5个碳原子的脂肪族
羧酸的酸卤的存在下,将所得产物与
甲醛反应,得到式为## STR3 ##的化合物,其中R为苯甲酰基或1至5个碳原子的脂肪族
羧酸基,将后者环化形成式为## STR4 ##的化合物,用稀释的
水矿酸选择性
水解后者,得到式为## STR5 ##的化合物,将后者经浓烈的
水矿酸
水解,形成权利要求1中化合物的酸盐,并可选择形成游离碱。