(2'R)-2-[2-(1H-indol-3-yl)-1-methoxycarbonyl-ethylcarbamoyl]-5-oxo-piperidine-1-carboxylic acid benzyl ester 、
1,3-丙二醇 在
草酸 作用下,
以
乙腈 为溶剂,
反应 20.0h,
生成 (9S,2'R)-9-[2-(1H-indol-3-yl)-1-methoxycarbonyl-ethylcarbamoyl]-1,5-dioxa-8-aza-spiro[5.5]undecane-8-carboxylic acid benzyl ester 、 (9R,2'R) 9-[2-(1H-lndol-3-yl)-1-methoxycarbonyl-ethylcarbamoyl]-1,5-dioxa-8-aza-spiro[5.5]undecane-8-carboxylic acid benzyl ester