1968 年 88 巻 2 号 p. 219-222
Condensations of octahydro-4-oxoquinolizidine (I) with ethyl 2-furoate and ethyl 2-thenoate afforded the respective products IIa and IIb, which were hydrolized to give enamines IVa and IVb. The reduction of IVa and IVb with sodium borohydride gave 4-substituted octahydroquinolizidines (VII) which were separated into VIIIa and Xa, and VIIIb and Xb, respectively.