Conversion of Allylic Alcohols into Allylic Nitromethyl Compounds via a Palladium-Catalyzed Solvolysis: An Enantioselective Synthesis of an Advanced Carbocyclic Nucleoside Precursor<sup>1</sup>
作者:Donald R. Deardorff、Kenneth A. Savin、Craig J. Justman、Zarir E. Karanjawala、James E. Sheppeck、David C. Hager、Nebil Aydin
DOI:10.1021/jo951510s
日期:1996.1.1
A two-step reaction sequence to homoallylic nitro compounds from allylic alcohols is presented. Ethoxy carbonylation of the alcohols with ethyl chloroformate provides the corresponding allylic ethyl carbonates in high yields. Exposure of these substrates to catalytic palladium(0) in CH(3)NO(2) initiates a reaction sequence, ionization-decarboxylation-nitromethylation, that culminates with the formation
提出了从烯丙基醇到均一硝基化合物的两步反应顺序。用氯甲酸乙酯对醇进行乙氧基羰基化,可以高收率得到相应的碳酸烯丙基碳酸酯。将这些底物暴露于CH(3)NO(2)中的催化钯(0)会引发反应序列,电离-脱羧化-硝基甲基化,最终形成硝基烯烃。硝基甲基烯丙基化反应的区域和立体化学结果可通过瞬时pi-allyalladium络合物的行为来解释。该方法学是重要碳环核苷中间体合成的核心。