Metal- and Base-Free Electrophilic Addition of 3-Diazooxindoles with <i>H</i>-phosphine Oxides for N–P Bond Formation
作者:Xiu Gu、Peng Xie、Jun Jiang、Yi Wu、Lisheng Wang
DOI:10.3184/174751918x15177590137425
日期:2018.2
This method has good chemoselectivity and broad substrate diversity, and provides a facile and green approach for N–P bond formation. The stereoselective synthesis represents a unique example of asymmetric electrophilic addition of diazo compounds as N-terminal electrophiles with phosphorus compounds, affording P-stereogenic phosphinic hydrazides with excellent stereoselectivity.
建立了在无金属和无碱条件下 3-重氮吲哚与 H-氧化膦的高效亲电加成,从而产生次膦酰肼。该方法具有良好的化学选择性和广泛的底物多样性,为 N-P 键的形成提供了一种简便、绿色的方法。立体选择性合成代表了重氮化合物作为 N 端亲电试剂与磷化合物的不对称亲电加成的独特例子,提供了具有优异立体选择性的 P-立体次膦酰肼。
Diastereoselective Three-Component Cascade Reaction to Construct Oxindole-Fused Spirotetrahydrofurochroman Scaffolds for Drug Discovery
作者:Lin Qiu、Dongwei Wang、Yubing Lei、Lixin Gao、Shunying Liu、Jia Li、Wenhao Hu
DOI:10.1002/ejoc.201600315
日期:2016.5
A one-pot synthesis of new oxindole-fused polycyclic scaffolds is reported. The process involves a three-component [3+2] cycloaddition followed by cyclization through an intramolecular Michaeladdition. The reaction gives easy access to oxindole-fused spirotetrahydrofurochromans in moderate to good yields with high regio- and diastereoselectivity. These compounds could be useful for for drug discovery
A concise synthetic route to spiroindoline-fused S-heterocycles was developed through copper-catalyzed [4 + 1] annulation using enaminothiones as donor–acceptor synthons. Both 3-diazoindolin-2-imines and 3-diazooxindoles were amenable to work as effective C1 building blocks. The reaction proceeds via a copper-catalyzed cascade process involving the in situ generation of copper(I) carbene and C–S/C–C