Abstract Three methods for the synthesis of the title compounds starting from benzyl 2,3,4-tri-O-benzyl-α- d -manno-hexodialdo-1,5-pyranoside (7 have been elaborated. Conversion of 7 into the cyanohydrin followed by reduction to give the amine and then deamination gave a derivative of l -glycero- d -manno-heptose in low yield. Condensation of 7 with 2-methylfuran gave two stereoisomeric 6-C-(2-methyl-5-furyl)
摘要合成了由苄基2,3,4-三-O-苄基-α-d-甘露六
己醛-1,5-
吡喃糖苷起始的三种标题化合物的合成方法(其中7种已被合成。7种转化为
氰醇然后还原得到胺,然后脱
氨基得到低产率的1-
甘油-d-甘露庚糖衍
生物,将7与
2-甲基呋喃缩合得到两个立体异构体6-C-(2-甲基-5-
呋喃基)。将主要的立体异构体进行
臭氧处理,然后还原得到d-
甘油-d-甘露庚糖衍
生物,将7与烯丙氧基甲基
镁氯化物缩合,可得到产率高且l-
甘油d-
甘油比率高的两种庚糖衍
生物。这些衍
生物的保护基比为3.2:1。脱保护得到的庚糖产率很高。