Synthesis of 3',3'-difluoro-2'- hydroxymethyl-4',5'-unsaturated carbocyclic nucleosides |
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| Authors: | Yang Yan-Yan Xu Jun You Zheng-Wei Xu Xiu-Hua Qiu Xiao-Long Qing Feng-Ling |
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| Institution: | Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China. |
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| Abstract: | 3',3'-Difluoro-2'-hydroxymethyl-4',5'-unsaturated carbocyclic nucleosides 1-3 have been stereoselectively synthesized from ester 10, which can be conveniently prepared from 2,3-isopropylidene-d-glyceraldehyde 7 in five steps. The whole synthesis highlighted the stereoselective Reformatskii-Claisen rearrangement, ring-closing metathesis (RCM), and palladium-catalyzed allylic alkylation, in which the regioselectivity was reversed from that of nonfluorinated substrates. |
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