Copyrine alkaloids: synthesis, spectroscopic characterization, and antimycotic/antimycobacterial activity of A- and B-ring-functionalized sampangines
摘要:
Several A- and B-ring-substituted sampangines were synthesized and evaluated for antifungal and antimycobacterial activity against AIDS-related opportunistic infection pathogens. Electrophilic halogenation provided a channel for structural elaboration of the sampangine B-ring at position 4, while the synthesis of A-ring 3-substituted sampangines and benzo[4,5]sampangine (24) were achieved from the corresponding functionalized cleistopholines. Two-dimensional NMR spectroscopy was used to rigorously characterize the A- and B-ring substituent patterns. Structure-activity relationship studies revealed the activity of the sampangines was enhanced by the presence of a substituent at position 3 or by a 4,5-benzo group.
Compounds and compositions useful as antifungal and antimycobacterial
申请人:The University of Mississippi
公开号:US05227383A1
公开(公告)日:1993-07-13
New analogs of sampangine and cleistopholine, compositions and methods of preparation thereof, method of treating fungal and mycobacterial infections. The compounds have the general formula: ##STR1## where the R.sub.1, R.sub.2, and R.sub.5 groups are defined herein.
Zjawiony, Jordan K.; Srivastava, Anita R.; Hufford, Charles D., Heterocycles, 1994, vol. 39, # 2, p. 779 - 800
作者:Zjawiony, Jordan K.、Srivastava, Anita R.、Hufford, Charles D.、Clark, Alice M.
DOI:——
日期:——
CuCl<sub>2</sub>-Promoted 6-<i>endo-dig</i> Chlorocyclization and Oxidative Aromatization Cascade: Efficient Construction of 1-Azaanthraquinones from <i>N</i>-Propargylaminoquinones
作者:Na Fei、Hao Yin、Shaozhong Wang、Huaqin Wang、Zhu-Jun Yao
DOI:10.1021/ol201542h
日期:2011.8.19
An efficient synthetic methodology was developed to assemble 1-azaanthraquinones from N-propargylaminoquinones by copper(II)-promoted sequential 6-endo-dig chlorocyclization and oxidative aromatization. The approach can be extended to preprare chlorinated alkaloids such as cleistophine and sampangine. A possible mechanism involving carbon-carbon bond formation triggered by regioselective electrophilic activation and carbon-chlorine bond formation via reductive elimination was proposed.
SAMPANGINE DERIVATIVES USEFUL AS ANTIFUNGAL AND ANTIMYCOBACTERIAL AGENTS