Synthesis of 3-substituted (azido, acylthio, chloro or fluoro)-2,3-dideoxy-D-erythro-pentoses and 3-methyl-3-substituted-2,3-dideoxy-D-erythro-pentoses
作者:Yuri E. Raifeld、Antonia A. Nikitenko、Boris M. Arshava、Igor E. Mikerin、Lubov L. Zilberg、Galina Ya. Vid、Stanley A. Lang、Ving J. Lee
DOI:10.1016/s0040-4020(01)85335-7
日期:1994.1
The enantioselective synthesis of 3-substituted and 3-methyl-3-substituted 2,3-dideoxy-D-erythro-pentoses from (3R,4R)-1,1-diethoxy-3,4-epoxypentane-5-ol, (3R,4R)-1,1-diethoxy-3,4-epoxy-3-methylpentane-5-ol and (2R,3R)-2,3-epoxy-5-hexen-1-ol is reported. The key step is cleavage of the oxirane ring by Ti(O-i-Pr)3X class reagents followed by selective cyclization of the acyclic acetals to the furanosides
由(3 R,4 R)-1,1-二乙氧基-3,4-环氧戊烷-5-醇对映体选择性合成3-取代的和3-甲基-3-取代的2,3-二脱氧-D-赤-戊糖,(3 R,4 R) -1,1-二乙氧基-3,4-环氧--3-甲基戊烷-5-醇和(2 R,3 R)-2,3-环氧-5-己烯-1-醇被报道。关键步骤是用Ti(O - Pr)3 X类试剂裂解环氧乙烷环,然后将无环缩醛选择性环化为呋喃糖苷。氟化与复合物钛(IV)的异-propoxide -钛(IV),氟化提供3-氟-2,3-二脱氧D-的对映选择性合成赤-戊糖和3-氟-3-甲基-2,3-二脱氧-D-赤型-戊糖。