Synthesis of pyrinodemins A and B. Assignment of the double bond position of pyrinodemin A
摘要:
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.
Synthesis of pyrinodemins A and B. Assignment of the double bond position of pyrinodemin A
摘要:
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.
N-substituted diphenylpiperidines and antiobesity use thereof
申请人:Hoffmann-La Roche Inc.
公开号:US04632925A1
公开(公告)日:1986-12-30
Compounds of the formula ##STR1## wherein R.sub.1 is ##STR2## the asterisk denotes the specific bonding orientation to the piperidine moiety; R.sub.2 is alkylene or --CO--(CH.sub.2).sub.n -- wherein n is 0 to 11; R.sub.3 and R.sub.4, independently, are hydrogen, halogen or lower alkoxy; and HET is pyridinyl, pyrimidinyl or imidazolyl, and salts thereof with pharmaceutically acceptable acids, are described. The compounds of formula I exhibit insulin lowering activity and are useful as antiobesity agents.
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.