(+)-(3aS,4R,7aS)-4-hydroxy-4-(m-tolylethynyl)-octahydro-indole-1-carboxylic acid methyl ester   、                                                                                      
N-ethyl-succinamic acid                                                                                                                                                                                                                                                                                                          以to yield (3aR,4S,7aR)-methyl 4-(4-(ethylamino)-4-oxobutanoyloxy)-4-(m-tolylethynyl)octahydro-1H-indole-1-carboxylate的产率得到(3aR,4S,7aR)-methyI 4-(4-(ethylamino)-4-oxobutanoyoxy)-4-(m-toyIethynyl)octahydro-1H-indole-1-carboxylate