abstract |
The present invention relates to a process for the production of (3aR,4S,7aR)-4-hydroxy-4-m--tolylethynyl-octahydro-indole-1-carboxylic acid methyl ester (I), of carbamic acid (2-chloroethyl)(3-oxocyclo-hexyl)-alkyl ester enantiomers (II), and of 1-carbalkoxy-4-ketoperhydroindole enantiomers (III). |