3a,4-dihydro-7,8-dimethoxy-3H-[1]benzopyrano[4,3-c]isoxazole-3-methanol methanesulfonate ester 、
5-(tert-butoxycarbonyl)amino-3-(1,2,3,6-tetrahydro-4-pyridinyl)-1H-indole 在
potassium iodide
potassium carbonate 作用下,
以
(methyl)isobutyl ketone 为溶剂,
以69%的产率得到tert-butyl N-[3-[1-[(7,8-dimethoxy-3a,4-dihydro-3H-chromeno[4,3-c][1,2]oxazol-3-yl)methyl]-3,6-dihydro-2H-pyridin-4-yl]-1H-indol-5-yl]carbamate