A chiral synthesis of 3,5,7-tri-O-benzyl-1,4,6-trideoxy-4,6-di-C-methyl-keto-l-ido-2-heptulose, a synthetic segment of the C-1–C-6 portion of erythronolide A
作者:Mitsuhiro Kinoshita、Naoki Ohsawa、Shuichi Gomi
DOI:10.1016/0008-6215(82)84027-5
日期:1982.11
Hydroboration of 13, followed by treatment with alkaline hydrogen peroxide, afforded a 4:1 mixture of 3,5-dideoxy-1,2-O-isopropylidene-3,5-di-C-methyl-β- l -idofuranose (14) and the α- d -gluco epimer (15) in 85% yield. Homogeneous hydrogenation of 21 with chlorotris(triphenylphosphine)rhodium(I) gave a 6.4:1 mixture of 15 and 14. Homogeneous hydrogenation of 1,6-anhydro-3,5-dideoxy-3-C-methyl-5-C-methylene-β-
摘要以甲基4,6-O-亚苄基-3-脱氧-3-C-甲基为原料制备了3,6-二脱氧-1,2-O-异亚丙基-3-C-甲基-α-d-葡萄糖呋喃糖(9)。通过3-脱氧-1,2-O-异亚丙基-3-C-甲基-α-d-葡糖呋喃糖(5)生成-α-d-吡喃葡萄糖苷,产率为61%。关键中间体3,5,6-三甲氧基-1,2-O-异亚丙基-3-C-甲基-5-C-亚甲基-α-d-木糖六呋喃糖(13)和3,5-二甲氧基-1由9和5分别制备了2-2-异亚丙基-3-C-甲基-5-C-亚甲基-α-d-二甲苯基呋喃糖(21)。13的硼氢化处理,然后用碱性过氧化氢处理,得到3,5-二脱氧-1,2-O-异亚丙基-3,5-二-C-甲基-β-1-基呋喃糖的4:1混合物(14 )和α-d-葡萄糖差向异构体(15),产率为85%。用氯三(三苯基膦)铑(I)进行21的均相氢化,得到6.4:1的15和14的混合物。