On the synthesis of pyrinodemin A. Part 1: The location of the olefin
摘要:
The elucidation of the structure of the cytotoxic marine sponge alkaloid pyrinodemin A by synthesis is described. Based on the C-13 NMR spectra of three double bond positional isomers and the natural product, it is concluded the C14'-C15' isomer best represents the true structure of pyrinodemin A. In addition, the structural assignment of pyrinodemin C is evaluated. (C) 2004 Elsevier Ltd. All rights reserved.
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.