Four acyloxy-isopimarane derivatives along with two known isopimarane diterpenoids, the flavone cirsimaritin and the sterols P-sitosterol and stigmasterol were isolated from the aerial parts of Aeollanthus rydingianus. The structures of the compounds were established on the basis of spectroscopic analysis and chemical evidence. The isolated substances were screened for antimicrobial activity against Gram-positive and Gram-negative bacteria and a yeast strain. 19-Acetoxy-7,15-isopimaradien-3 beta-ol and 7,15-isopimaradien-19-ol showed minimum inhibitory concentration (MIC) values of 3.90-15.62 mu g/ml for Staphylococcus aureus and of 7.81 mu g/ml for Enterococcus hirae. (C) 2009 Elsevier Ltd. All rights reserved.
作者:Curini, Massimo、Coccia, Rita、Ceccherelli, Paolo
DOI:——
日期:——
Carbon-carbon bond formation by the reduction of dienic esters
作者:Massimo Curini、Rita Coccia、Paolo Ceccherelli、Timothy D. J. Halls、Barry Porter、Ernest Wenkert
DOI:10.1021/jo00185a057
日期:1984.6
Acid-catalysed decomposition of β,γ-unsaturated diazo-ketones preparation of 4,4-dimethyl-<scp>D</scp>-nor-steroidal systems from pimaradiene and sandaracopimaradiene precursors
4-Dimethyl-17-nor-5α,13α-androst-8-en-16-one (9) and 3β-acetoxy-4,4-dimethyl-17-nor-5α-androst-8-en-16-one (19) have been prepared by the acid-catalysed intramolecular cyclization of 16-diazopimar-8(14)-en-15-one (7) and 3β-acetoxy-16-diazoisopimar-7-en-15-one (16) prepared from pimara-8(14),15-diene (5) and isopimara-7,15-dien-3β-ol acetate (10), respectively.