of Morita–Baylis–Hillman (MBH) carbonates has been developed from ninhydrin. These MBH carbonates have been successfully employed as 3C-synthons in the organocatalytic asymmetric [3 + 2]-annulations of the isatin-derived electron-deficient olefins, affording structurally diverse spirooxindoles in high yield with excellent stereoselectivity. In particular, the regioselectivity of MBH carbonates was
一种由
茚三酮开发的 Morita-Baylis-Hillman (MBH)
碳酸盐。这些 MBH
碳酸酯已成功地作为 3C-合成子用于
靛红衍生的缺电子烯烃的有机催化不对称 [3 + 2]-环化反应,从而以高产率和优异的立体选择性提供结构多样的螺羟
吲哚。特别是,MBH
碳酸酯的区域选择性由反应伙伴控制,具有羰基的 3-亚甲氧
吲哚 (R = ArCO),提供 β-选择性产物和具有酯基的 3-亚甲氧
吲哚 (R = CO 2 Me),提供γ-选择性产品。检查了代表性的放大反应和产物转化。通过对照实验阐明了反应机理。