Rhodium-Catalyzed Asymmetric Nitroallylation of Arylmetallics with Cyclic Nitroallyl Acetates and Applications in Organic Synthesis
作者:Lin Dong、Yan-Jun Xu、Wei-Cheng Yuan、Xin Cui、Lin-Feng Cun、Liu-Zhu Gong
DOI:10.1002/ejoc.200600275
日期:2006.9
Highly enantioselective rhodium-catalyzed nitroallylations of arylboronic acids and arylzinc chlorides with cyclic nitroallyl acetates are described. Catalyst screening indicated that the rhodium complex of [Rh(OH)(COD)]2 and optically pure binap is the optimal catalyst for the nitroallylation of arylboronic acids with 2-nitrocyclohex-2-enyl esters, providing good yields and high enantioselectivities
描述了芳基硼酸和芳基氯化锌与环状硝基乙酸烯丙酯的高度对映选择性铑催化硝基烯丙基化反应。催化剂筛选表明,[Rh(OH)(COD)]2 和旋光纯二萘乙酸的铑配合物是芳基硼酸与 2-硝基环己-2-烯基酯硝基烯丙基化的最佳催化剂,具有良好的收率和较高的对映选择性。到 99% ee。由 Rh(acac)(C2H4)2 和 (R)-binap 制备的铑配合物在 0 °C 下有效催化芳基氯化锌与 2-硝基环己-2-烯基乙酸酯的硝基烯丙基化反应,产率高达 93%,并且高达 96 % ee 的对映选择性。以此反应为起点制备了许多具有高光学纯度的合成有用的中间体:从 3,4-亚甲基二氧苯基氯化锌与 2- 的不对称硝基烯丙基化开始,实现了总产率为 53% 的光学纯 (+)-β-lycorane 和总产率为 52% 的 (+)-γ-lycorane 的简洁全合成。硝基环己-2-烯基乙酸酯。(© Wiley-VCH