Synthesis of 6-Substituted 7-Carbapurine 2′,3′-Dideoxynucleosides: Solid-Liquid Phase-Transfer Glycosylation of 4-Chloropyrrolo[2,3-<i>d</i>]pyrimidine and Deoxygenation of its 2′-Deoxyribofuranoside
作者:F. Seela、H. -P. Muth、U. Bindig
DOI:10.1055/s-1988-27667
日期:——
Several 4-substituted pyrrolo[2,3-d]pyrimidine 2′, 3′-dideoxyribofuranosides including 2′,3′-dideoxytubercidin (10) and 2′,3′-dideoxy-7-carbainosine (12) are prepared from 4-chloro-7-(2,3-dideoxy-β-D-glycero-pentofuranosyl)-7H-pyrrolo [2,3-d]pyrimidine (8). Compound 8 is obtained from the corresponding 4-chloro-7-(2-deoxy-β-D-erythro-pentofuranosyl)-7H-pyrrolo [2,3-d]pyrimidine (4a) via Barton-deoxygenation. Its protected precursor 3 is accessible in 81% yield by solid-liquid phase-transfer glycosylation.
几种 4-取代的吡咯并[2,3-d]嘧啶 2′,3′-二脱氧呋喃核苷,包括 2′,3′-二脱氧小檗碱(10)和 2′、由 4-氯-7-(2,3-二脱氧-δ-D-甘油-戊呋喃糖基)-7H-吡咯并[2,3-d]嘧啶(8)制备得到。化合物 8 由相应的 4-氯-7-(2-脱氧-δ-D-赤式戊呋喃糖基)-7H-吡咯并[2,3-d]嘧啶 (4a) 通过巴顿脱氧反应制得。通过固-液相转移糖基化反应,可获得其受保护的前体 3,收率为 81%。