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【英文名称】Methylsulfenyl Trifluoromethanesulfonate
【分子式】C2H3F3O3S2
【分子量】196.19
【CA登录号】84224-66-8
【物理性质】溶于1,2-二氯乙烷[1]、CH2Cl2和乙腈[1,2]。其它物理性质及化合物表征未见报道。
【制备和商品】该试剂一般在实验过程中原位制备和使用。在避光条件下,将甲基亚磺酰溴滴加入到三氟甲磺酸银在干燥的1,2-二氯乙烷的悬浮液中。然后,用针管将上层清液取出立即使用[1]。另一种原位制备该试剂的方法是在有4A分子筛的情况下,将甲基亚磺酰溴加入底物和三氟甲基磺酸银的混合物中[1]。
【注意事项】具有腐蚀性和刺激性,须在通风橱中操作和使用。
三氟甲磺酸甲基硫酯是一种从硫糖苷生成氧糖苷键的活化剂[1~4]。通过提供烃硫基离子,它可以用于硫糖苷的1,2-反式糖苷化(式1)[1]。在没有三氟甲磺酸银的时候,甲亚磺酰溴无法引发糖苷化反应[1]。 用三氟甲磺酸甲基硫酯可以有效地制备O-糖基化氨基酸(式2)[3],该产物是用来合成糖肽的重要前体[3,4]。由于它具有较高的反应活性,因此反应在低温下进行可以有效地抑制副反应的发生。使用类似的方法,也可以高产率地合成四糖[5]。 三氟甲磺酸甲基硫酯还可以用于活化环化反应,合成用于(+)-mannostatin A全合成的关键中间体(式3)[6]。 参考文献 1. Dasgupta, F.; Garegg, P. Carbohydr. Res. 1988,177, C13. 2. Dasgupta, F.; Garegg, P. Carbohydr. Res. 1990,202,225. 3. Dziadek, S.; Griesinger, C.; Kunz, H.; Reinscheid, U. M. Chem. Eur. J. 2006, 72,4981. 4. Kunz, Peptide Sci. 2003, 9,563. 5. Filser, C.; Kowalczyk, D.; Jones, C.; Wild, M. K.; Ipe, U.; Vestweber, D,; Kunz, H. Angew. Chem” Int. Ed 2007, 46,2108. 6. Li, C.; Fuchs, P. L. Tetrahedron Lett. 1994,35,5121.
本文摘自---现代有机合成试剂

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