A new route toward 2-acetamido-4-O-methyl-2-deoxy-d-mannopyranose from a Ferrier derivative of tri-O-acetyl-d-glucal, which contributes to aldolase-catalyzed synthesis of laninamivir (CS-8958)
作者:Hayato Okazaki、Kengo Hanaya、Mitsuru Shoji、Noriyasu Hada、Takeshi Sugai
DOI:10.1016/j.tet.2013.07.018
日期:2013.9
was the starting material, and it was derived via Ferrier reaction from tri-O-acetyl-d-glucal. The total yield was 43% over six steps from the starting material. As the key steps, Payne oxidation provided a syn-epoxy alcohol, and the inversion from an aziridine to an oxazoline proceeded stereoselectively. Although the ring opening reaction of the epoxide with an azide gave both the 2- and 3-azido regioisomers
朝向2-乙酰氨基-4-甲新路线ö -2-脱氧-甲基d -mannopyranose(4- Ò -methylManNAc),7-化学-酶促前体ö -methylsialic酸和拉尼米韦,建立了。已知的p -甲氧基苯基6- ø - (叔丁基二甲基硅烷基)-2,3-二脱氧α- d -赤-己-2-烯吡喃糖苷为起始原料,和它是通过从三Ferrier的反应衍生ö乙酰基d-葡萄糖醛。从起始原料开始的六个步骤的总产率为43%。作为关键步骤,佩恩氧化提供了一种合成-环氧醇,并且从氮丙啶转化为恶唑啉是立体选择性地进行的。尽管环氧化物与叠氮化物的开环反应给出了2-和3-叠氮基区域异构体,但是它们可以通过独立的途径合并成所需的氮丙啶。