Synthesis, Structure, and Conformation of 2′,3′-Fused Oxathiane and Thiomorpholine Uridines
作者:Jingbo Sun、Jinchang Wu、Hua Yang
DOI:10.1002/hlca.200790199
日期:2007.10
two 2′,3′-fused bicyclic nucleoside analogues, i.e., 1-[(4aR,5R,7R,7aS)-hexahydro-5-(hydroxymethyl)-4,4-dioxidofuro[3,4-b][1,4]oxathiin-7-yl]pyrimidine-2,4(1H,3H)-dione (1a) and 1-[(4aS,5R,7R,7aS)-hexahydro-7-(hydroxymethyl)-1,1-dioxido-2H-furo[3,4-b][1,4]thiazin-5-yl]pyrimidine- 2,4(1H,3H)-dione (1b), are described, the key step being an intramolecular hetero-Michael addition. Their structures and
两个2',3'稠合的双环核苷类似物,即1-[((4a R,5 R,7 R,7a S)-六氢-5-(羟甲基)-4,4-dioxidofuro [3, 4- b ] [1,4]草苷-7-基]嘧啶-2,4(1 H,3 H)-二酮(1a)和1-[(4a S,5 R,7 R,7a S)-六氢-7-(羟甲基)-1,1-二氧化物-2 H-呋喃[3,4- b ] [1,4]噻嗪-5-基]嘧啶-2,4(1 H,3 H)-二酮(1b),其中关键步骤是分子内杂-迈克尔加成。使用1D和2D-NMR以及HR-MS分析,可以更详细地分析以前通过X射线晶体学解决的它们的结构和构象。