This preliminary study reports on the synthesis of two new boron-capsaicin derivatives containing either a short or long chain aliphatic tail group using an iridium catalyzed hydroboration reaction with pinacolborane. The boronate ester groups reside on the terminal position of the tail group and are necessary for the bioactivity of these compounds. Indeed, both compounds showed considerable activity against two Gram-positive bacteria, including Vancomycin-resistant Enterococcus. Vancomycin is considered the last resort medication for the treatment of septicemia, and new antibacterial agents that can treat sepsis are of paramount importance. The more lipophilic boron compound with the longer aliphatic chain also showed antifungal activity against Saccharomyces cerevisiae.
这项初步研究报告了利用铱催化的氢硼化反应与缩水甘醇硼烷合成了两种新的含有短链或长链脂肪基尾基的硼-辣椒素衍生物。硼酯酯基位于尾基的末端位置,对这些化合物的生物活性是必要的。事实上,这两种化合物对包括耐万古霉素肠球菌在内的两种革兰氏阳性细菌表现出相当的活性。万古霉素被认为是治疗败血症的最后手段药物,寻找可以治疗败血症的新抗菌剂至关重要。带有较长脂肪链的更疏水性硼化合物还显示出对酿酒酵母的抗真菌活性。