(6S,7R,9E,10S,11S,11aS)-9-ethylidene-5,6,8,9,10,11,11a,12-octahydro-11-(hydroxymethyl)-5-methyl-6,10-methanoindolo[3,2-b]quinolizine-11-carboxaldehyde 、
乙酸酐 在
4-二甲氨基吡啶 作用下,
以
二氯甲烷 为溶剂,
以84%的产率得到Acetic acid (2S,6S,12bS,13S)-3-eth-(E)-ylidene-13-formyl-12-methyl-1,3,4,7,12,12b-hexahydro-2H,6H-2,6-methano-indolo[2,3-a]quinolizin-13-ylmethyl ester