A new EGF-active polymeric pyridinium alkaloid from the sponge Callyspongia fibrosa
摘要:
An inhibitor of the epidermal growth factor (EGF) receptor was isolated from an extract of the Micronesian sponge Callyspongia fibrosa. The structure of the EGF-active compound was first proposed, on the basis of ion-spray mass spectrometry, to be the cyclic dimer 1 (n = 2) but comparison of a sample produced by an efficient synthetic route revealed that hypothesis to be incorrect. The EGF-active constituent must therefore be a large oligomer or a polymer of the same repeating subunit 1.
Synthesis of pyrinodemins A and B. Assignment of the double bond position of pyrinodemin A
作者:Barry B Snider、Bo Shi
DOI:10.1016/s0040-4039(01)00003-x
日期:2001.2
Condensation of aldehyde 3a with hydroxylamine 4b afforded nitrone 2, which underwent an intramolecular cycloaddition to give Ib, the proposed structure of pyrinodemin A. A similar condensation of aldehyde 3a and hydroxylamine 4a provided pyrinodemin A (1a), which has the double bond one carbon further away from the isoxazolidine. An analogous sequence gave pyrinodemin B (21). (C) 2001 Elsevier Science Ltd. All rights reserved.
A new EGF-active polymeric pyridinium alkaloid from the sponge Callyspongia fibrosa
作者:Michael T. Davies-Coleman、D. John Faulkner、Gene M. Dubowchik、Gregory P. Roth、Craig Polson、Craig Fairchild
DOI:10.1021/jo00074a017
日期:1993.10
An inhibitor of the epidermal growth factor (EGF) receptor was isolated from an extract of the Micronesian sponge Callyspongia fibrosa. The structure of the EGF-active compound was first proposed, on the basis of ion-spray mass spectrometry, to be the cyclic dimer 1 (n = 2) but comparison of a sample produced by an efficient synthetic route revealed that hypothesis to be incorrect. The EGF-active constituent must therefore be a large oligomer or a polymer of the same repeating subunit 1.
First total synthesis of niphatesines A-D and assignment of absolute configuration
作者:AV Rama Rao、Gongiti Ravindra Reddy
DOI:10.1016/s0040-4039(00)61423-5
日期:1993.12
Regio/Enantioselective synthesis of niphatesines A-D is achieved making use of Pd(O) assisted 3-alkylation of pyridine as the key step. Absoluteconfiguration of niphatesines C and D is established.