Novel Stereoselective Control over Cis vs Trans Opening of Benzo[<i>c</i>]phenanthrene 3,4-Diol 1,2-Epoxides by the Exocyclic <i>N</i><sup>2</sup>-Amino Group of Deoxyguanosine in the Presence of Hexafluoropropan-2-ol
作者:Haruhiko Yagi、Andagar R. Ramesha、Govind Kalena、Jane M. Sayer、Subodh Kumar、Donald M. Jerina
DOI:10.1021/jo020418a
日期:2002.9.1
We describe a novel and efficient synthesis (62-84% yields) of the eight possible, diastereomerically pure, cis and trans, R and S O(6)-allyl-protected N(2)-dGuo phosphoramidite building blocks derived through cis and trans opening of (+/-)-3alpha,4beta-dihydroxy-1beta,2beta-epoxy-1,2,3,4-tetrahydrobenzo[c]phenanthrene [BcPh DE-1 (1)] and (+/-)-3alpha,4beta-dihydroxy-1alpha,2alpha-epoxy-1,2,3,4-te
我们描述了八种可能的,非对映体纯,顺式和反式,R和SO(6)-烯丙基保护的N(2)-dGuo亚磷酰胺结构单元,通过顺式和反式衍生的新型有效合成方法(62-84%产率) (+/-)-3alpha,4beta-dihydroxy-1beta,2beta-epoxy-1,2,3,4-四氢苯并[c]菲[BcPh DE-1(1)]和(+/-)-3alpha的打开六氟丙烷-2-醇(HFP)介导的O(6)合成1,4beta-二羟基-1alpha,2alpha-环氧-1,2,3,4-四氢苯并[c]菲[BcPh DE-2(2)] -在环氧化合物的C-1处的-烯丙基-3′,5′-二-O-(叔丁基二甲基甲硅烷基)-2′-脱氧鸟苷(3)。只需改变反应混合物中HFP的相对用量,即可实现宽比例的顺式/反式加成产物。从而,在5当量3的存在下,DE-1(1)在HFP的5-532当量范围内观察到的顺式/反式加合物比率从17