(+)-(3aS,4R,7aS)-4-hydroxy-4-(m-tolylethynyl)-octahydro-indole-1-carboxylic acid methyl ester 、
ethyl valeramidate 以to yield (3aR,4S,7aR)-methyl 4-(5-(ethylamino)-5-oxopentanoyloxy)-4-(m-tolylethynyl)octahydro-1H-indole-1-carboxylate的产率得到(3aR,4S,7aR)-methyl 4-(5-(ethylamino)-5-oxopentanoyloxy)-4-(m-tolylethynyl)octahydro-1H-indole-1-carboxylate