(1R*,10S)-(1-sec-butyl-5-cyano-7-hydroxy-8-methyl-1,3,4,9-tetrahydro-pyrano[3,4-b]indol-1-yl)-acetic acid ethyl ester 、
2-溴乙基乙基醚 在
caesium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 5.0h,
生成
(1R*,10S)-[1-sec-butyl-5-cyano-7-(2-ethoxy-ethoxy)-8-methyl-1,3,4,9-tetrahydro-pyrano[3,4-b]indol-1-yl]-acetic acid ethyl ester 、 (1R*,10S)-[1-sec-butyl-5-cyano-7-(2-ethoxy-ethoxy)-8-methyl-1,3,4,9-tetrahydro-pyrano[3,4-b]indol-1-yl]-acetic acid ethyl ester