、 、 (+)-1-(2-Methoxyethoxymethyl)-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine 、 辛可尼丁 在
乙醇 作用下,
以
lower alkanol 、 乙醇 为溶剂,
反应 16.0h,
以to provide the optically resolved salt of either the (R)-18 or (S)-18的产率得到(R)-1-(2-methoxyethoxy)methyl-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine
Compound of formula 1 are calcium entry antagonists useful for treating hypertension, congestive heart failure, angina, and vasospastic disorders: ##STR1## wherein n is an integer from 1 to 4; R.sub.1 and R.sub.2 are lower alkyl; R.sub.3 is lower alkyl or alkoxyalkyl; A is alkylene of two to eight carbon atoms; X.sub.1 and X.sub.2 are each independently --NO.sub.2, --CF.sub.3, CH.sub.3 O--, --CN, --H, lower alkyl or halo; Y is --O--, --S--, --S(O)--, or --S(O).sub.2 --; and R is H, lower alkyl, cycloalkyl, alkoxyalkyl, cycloalkyloxy-alkyl, alkoxycycloalkyl, acyl, or saturated or unsaturated 5- or 6-membered heterocyclyl optionally substituted with lower alkyl or alkoxy, wherein the heteroatom is one oxygen atom.