Enantioselective and diastereoselective azo-coupling/iminium-cyclizations: a unified strategy for the total syntheses of (−)-psychotriasine and (+)-pestalazine B
Concise total synthesis and structural revision of (+)-pestalazine B
作者:Carlos Pérez-Balado、Ángel R. de Lera
DOI:10.1039/c0ob00531b
日期:——
A convergent synthesis of the proposed structure of (+)-pestalazine B has been achieved in 4 steps using the N-alkylation of an unprotected tryptophan diketopiperazine with a 3a-bromopyrrolidinoindoline as the key step. Although its structure was confirmed by X-ray analysis, the spectroscopic data did not match those of the natural product. The versatility of the methodology allowed the preparation
Solid-phase synthesis of a library of piperazinediones and diazepinediones via kaiser oxime resin
作者:Roger A. Smith、Mark A. Bobko、Wendy Lee
DOI:10.1016/s0960-894x(98)00428-4
日期:1998.9
been prepared by automated parallel solid-phase synthesis. The five-step reaction protocol makes use of Kaiser oxime resin, to enable cleavage from the polymeric support concomitant with an intramolecular displacement reaction, under very mild conditions. The methodology was also successfully extended to the preparation of the seven-memberedringhomologs, diazepinediones.