Stereoselective synthesis of the lichen metabolite, (+) montagnetol and its congeners as antimicrobial agents
作者:Uppuluri Venkata Mallavadhani、Ramakrishna Boddu、Balaji B. Rathod、Prakasam Reddy Setty
DOI:10.1080/00397911.2018.1519076
日期:2018.12.2
major metabolite of the fruticose lichen, Roccella montagnei was synthesized along with three of its congeners by employing highly efficient protocols. (+) Montagnetol (2 R, 3S; 11) and (-) montagnetol (2S, 3R; 5) were synthesized in 7 and 9 steps, respectively, from L-ascorbic acid. The two new congeners 3 (2 R, 3R) and 6 (2S, 3S), which differ in configuration at C-2 and C-3 positions of the (+) montagnetol
摘要 鉴于结构多样性,果糖地衣 Roccella montagnei 的主要代谢物 (+) montagnetol 与其三个同类物一起通过高效的方案合成。(+) Montagnetol (2 R, 3S; 11) 和 (-) Montagnetol (2S, 3R; 5) 分别通过 7 步和 9 步从 L-抗坏血酸合成。两个新的同源物 3 (2 R, 3R) 和 6 (2S, 3S) 在 (+) montagnetol 的 C-2 和 C-3 位置的构型不同,是由 (-) D-酒石酸二乙酯和(+) L-酒石酸二乙酯,分别。在体外评估了合成的化合物对两种革兰氏阳性菌(金黄色葡萄球菌和大肠杆菌)和两种革兰氏阴性菌(伤寒沙门氏菌和铜绿假单胞菌)和一种真菌菌株白色念珠菌的抗菌活性。有趣的是,同源物 3 对铜绿假单胞菌显示出有希望的抗菌活性(MIC:0.062 µg/ml),而同源物 6 对白色念珠菌显示出有效的抗真菌活性(MIC:0