Facile synthesis of unusual glycosyl carbamates and amino acid glycosides from propargyl 1,2-orthoesters as glycosyl donors
作者:Ashif Y. Shaikh、Gopalsamy Sureshkumar、Debasish Pati、Sayam Sen Gupta、Srinivas Hotha
DOI:10.1039/c1ob05056g
日期:——
Propargyl 1,2-O-orthoesters are exploited for the synthesis of 1,2-trans O-glycosides of protected amino acids. N-Fmoc- and N-Cbz protected serine/threonine - benzyl/methyl esters reacted well with glucosyl-, galactosyl-, mannosyl- and lactosyl- derived propargyl 1,2-orthoesters affording respective 1,2-transglycosides in good yields under AuBr3/4 Å MS Powder/CH2Cl2/rt. t-Boc serine derivative gave
炔丙基1,2- O-原酸酯被用于合成被保护氨基酸的1,2-反式O-糖苷。N -Fmoc-和N -Cbz保护的丝氨酸/苏氨酸-苄基/甲酯与葡萄糖基,半乳糖基,甘露糖基和乳糖基衍生的炔丙基1,2-原酸酯反应良好,在较低的收率下提供各自的1,2-反式糖苷AuBr 3 /4ÅMS粉末/ CH 2 Cl 2 / rt。t -Boc丝氨酸衍生物可得到丝氨酸1,2-原酸酯和氨基甲酸糖基酯。优化的条件使得能够从N制备新的氨基甲酸酯糖基-Boc使用金催化剂和炔丙基1,2-原酸酯以优异的产率一步一步保护胺。