(Method A).-To a solution of 1.0 g. of S-carbobenzoxy-DL-phenylalanine cyanomethyl ester in 7 ml. of ethyl acetate 0.17 ml. of 2-hydroxyethylamine was added, and the mixture was stirred overnight at room temperature. The solvent was removed under reduced prehsure aiid the re-idue was diaholved in CBC1,. The CHC1, solution waa washed with a small volume of cold, saturated Sac1 coiitaiiiirig a few drops of dilute IICI, then with a small ...
![tert-butyl 5-[[3-[[3,4-dimethyl-5-[(2-methylpropan-2-yl)oxycarbonyl]-1H-pyrrol-2-yl]methylidene]-2-oxocyclopentylidene]methyl]-3,4-dimethyl-1H-pyrrole-2-carboxylate Structure](https://image.chemsrc.com/caspic/149/4914-45-8.png)
