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
Concise total synthesis of (+)-asperazine A and (+)-pestalazine B
作者:Brandon M. Nelson、Richard P. Loach、Stefan Schiesser、Mohammad Movassaghi
DOI:10.1039/c7ob02985c
日期:——
The highly convergent totalsynthesis of dimeric diketopiperazine alkaloids (+)-asperazine A and (+)-pestalazine B is described. A critical aspect of our expedient route was the development of a directed regio- and diastereoselective C3–N1′ coupling of complex tetracyclic diketopiperazine components. This late-stage heterodimerization reaction was made possible by design of tetracyclic diketopiperazines
描述了二聚二酮哌嗪生物碱 (+)-阿哌嗪 A 和 (+)-哌司他嗪 B 的高度收敛全合成。我们的应急路线的一个关键方面是开发复杂的四环二酮哌嗪组分的定向区域和非对映选择性 C3-N1' 偶联。这种后期异二聚反应是通过四环二酮哌嗪的设计实现的,四环二酮哌嗪允许亲电子组分与亲核片段的 N1' 位点进行 C3-碳正离子偶联。将这种新的偶联反应应用于 (+)-asperazine A 的首次全合成,使我们对所报道结构的旋光度符号和大小进行了修改。