of this oxidativecyclization was discussed. In addition, morusin hydroperoxide (II) was also obtained by photo-sensitized oxidation of morusin (I) in the presence of sensitizers (Rose Bengal, hematoporphyrin). To elucidate the reaction mechanism similar reactions were carried out in the presence of radical quencher (2,4,6-tri-t-butylphenol) or singlet oxygen quencher (triethylenediamine). From these
Total Syntheses and Antibacterial Evaluations of Neocyclomorusin and Related Flavones
作者:Hongbo Dong、Min Wu、Shengwei Xiang、Tao Song、Ying Li、Bin Long、Chuanling Feng、Zheng Shi
DOI:10.1021/acs.jnatprod.2c00658
日期:2022.9.23
Friedel–Crafts reaction, a Baker–Venkataraman (BK-VK) rearrangement, a selective epoxidation, and a novel SN2-type cyclization as the key steps. The present protocol was also successfully applied for the total synthesis of oxyisocyclointegrin (2). Structurally related natural products morusin (23) and cudraflavone B (24) were also prepared. We investigated the antibacterial activities of these natural compounds
Neocyclomorusin ( 1 ) 是一种天然生物活性吡喃黄酮,主要从桑科植物中分离出来,通过 Friedel-Crafts 反应、Baker-Venkataraman (BK-VK) 重排、选择性环氧化和新型 S 首次合成。N 2 型环化为关键步骤。本方案还成功应用于氧异环整合素(2)的全合成。还制备了结构相关的天然产物morusin ( 23 ) 和cudraflavone B ( 24 )。我们研究了这些天然化合物对革兰氏阴性和革兰氏阳性菌株的抗菌活性。异戊二烯化黄酮桑黄素 ( 23 ) 和 cudraflavone B ( 24 ) 的抗金黄色葡萄球菌活性与氨苄青霉素和卡那霉素 A 相当。Morusin ( 23 ) 和cudraflavone B ( 24 ) 对革兰氏阳性菌表皮葡萄球菌和枯草芽孢杆菌均表现出比氨苄西林更好的抗菌活性。新环桑素 ( 1 ) 和氧化异环整合素