(±)-Gusanlung A, 8-oxyberberrubine and (±)-gusanlung D have been synthesized by radical cyclisation of the corresponding 2-aroyl-1-methylenetetra- hydroisoquinolines. The 1H and 13C spectra of (-)-gusanlung D were found to be different from those of synthetic (±)-gusanlung D. Careful analyses of the 13C spectra of (–)-gusanlung A and natural 8-oxyberberrubine also cast doubt on the correctness of the structures previously assigned to these two compounds. (±)-Gusanlung A and (±)-gusanlung D were inactive against Staphylococcus aureus ATCC25932, Escherichia coli ATCC10536 and Candida albicans ATCC90028.
(±)-Gusanlung A、8-oxyberberrubine 和 (±)-gusanlung D 是通过相应的 2-芳酰基-1-亚甲基
四氢异喹啉的自由基环化合成的。对 (-)-gusanlung A 和天然 8-oxyberberrubine 的 13C 光谱进行仔细分析后,发现 (-)-gusanlung D 的 1H 和 13C 光谱与合成 (±)-gusanlung D 的光谱不同。(±)-Gusanlung A 和 (±)-Gusanlung D 对
金黄色葡萄球菌 A
TCC25932、大肠杆菌 A
TCC10536 和白色念珠菌 A
TCC90028 均无活性。