Total syntheses of ert-conduramine A and ent-7-deoxypancratistatin
摘要:
The first total synthesis of the title alkaloid has been accomplished in fourteen steps form 1-bromo-4-iodobenzene or 1-fluoro-4-iodobenzene via chemoenzymatic production of the antipodal cis-diene diols 4. (C) 1999 Elsevier Science Ltd. All rights reserved.
Enantioselective Nitroso-Diels-Alder Reaction and Its Application for the Synthesis of (−)-Peracetylated Conduramine A-1
作者:Chandan Kumar Jana、Stefan Grimme、Armido Studer
DOI:10.1002/chem.200901331
日期:2009.9.14
CuI‐catalyzed enantioselective nitroso‐Diels–Alderreactions (NDA reactions) of 2‐nitrosopyridine with various dienes are presented. The [CuPF6(MeCN)4]/Walphos‐CF3 catalyst system is best suited to catalyze the NDA reaction of various dienes by using 2‐nitrosopyridine as a dienophile. In most of the cases studied, cycloadducts are obtained in quantitative yield with very good to excellent enantioselectivities
Advances in Siloxane-Based Coupling Reactions: Application of Palladium-Mediated Allyl-Aryl Coupling to the Synthesis of Pancratistatin Derivatives. The Formal Total Synthesis of (±)-7-Deoxypancratistatin
作者:Philip DeShong、Krupa H. Shukla
DOI:10.3987/com-12-s(n)35
日期:——
Palladium-mediated coupling of an allylic carbonate and an aryl siloxane has been applied to the formal total synthesis of 7-deoxypancratistatin and pancratistatin analogues. The key coupling reaction involved the use of a novel palladium olefin complex resulting in regio- and stereoselective arylation yielding a tetracyclic A-C ring intermediate. The observed regioselectivity of the coupling reaction was consistent with a model in which an unsymmetrical pi-allyl palladium complex was formed. Coupling of a variety of substituted phenyl siloxane derivatives was achieved using the new Pd(0) system to provide access to novel pancratistatin derivatives.
Total syntheses of ert-conduramine A and ent-7-deoxypancratistatin
作者:Hülya Akgün、Tomas Hudlicky
DOI:10.1016/s0040-4039(99)00434-7
日期:1999.4
The first total synthesis of the title alkaloid has been accomplished in fourteen steps form 1-bromo-4-iodobenzene or 1-fluoro-4-iodobenzene via chemoenzymatic production of the antipodal cis-diene diols 4. (C) 1999 Elsevier Science Ltd. All rights reserved.
Total Synthesis and Biological Evaluation of <i>Amaryllidaceae</i> Alkaloids: Narciclasine, <i>e</i><i>nt</i>-7-Deoxypancratistatin, Regioisomer of 7-Deoxypancratistatin, 10b-<i>e</i><i>pi</i>-Deoxypancratistatin, and Truncated Derivatives<sup>1</sup>
作者:Tomas Hudlicky、Uwe Rinner、David Gonzalez、Hulya Akgun、Stefan Schilling、Peter Siengalewicz、Theodore A. Martinot、George R. Pettit
DOI:10.1021/jo020129m
日期:2002.12.1
efficient total syntheses of the major Amaryllidaceaealkaloids, all based on the key enzymatic dioxygenation of suitable aromatic precursors. This paper discusses the logic of general synthetic design for lycoricidine, narciclasine, pancratistatin, and 7-deoxypancratistatin. Experimental details are provided for the recently accomplished syntheses of narciclasine, ent-7-deoxypancratistatin, and 10b