Expedient synthesis of the heneicosasaccharyl mannose capped arabinomannan of the Mycobacterium tuberculosis cellular envelope by glycosyl carbonate donors
作者:Maidul Islam、Ganesh P. Shinde、Srinivas Hotha
DOI:10.1039/c6sc04866h
日期:——
The global incidence of tuberculosis is increasing at an alarming rate, and Mycobacterium tuberculosis (Mtb) is the causative agent for tuberculosis, a disease with high mortality. Lipoarabinomannan (LAM) is one of the major components of the Mtb cellular envelope and is an attractive scaffold for developing anti-tubercular drugs, vaccines and diagnostics. Herein, a highly convergent strategy is developed
结核病的全球发病率正以惊人的速度增长,结核分枝杆菌(Mtb)是导致高死亡率的结核病的病原体。Lipoarabinomannan(LAM)是Mtb细胞包膜的主要成分之一,是开发抗结核药,疫苗和诊断剂的有吸引力的支架。本文中,首次提出了高度收敛的策略以合成heneicosasaccharyl arabinomannan。在这项工作中所合成的arabinomannan具有几个1,2-反式或α-阿糖胞苷˚F键和三个1,2-顺或β-阿糖胞苷˚F键端与封端的1,2-反式或α-曼p联系。所有关键的糖苷化反应都是在[Au] / [Ag]催化条件下用碳酸炔基糖基供体进行的,即使对于复杂的和支链的低聚糖之间的反应,也具有出色的收率和立体选择性。将所得的烯丙基寡糖整体脱保护,以得到半纤维素糖基阿拉伯甘露聚糖,其为丙基糖苷。总之,用56个步骤完成了heneicosasaccharyl甘露糖加帽的阿拉伯甘露聚糖的合成,总收率为0