An efficient organocatalytic Michael-aldol cascade reaction for the asymmetric synthesis of spirocyclic oxindole derivatives fused with tetrahydrothiophenes has been developed through a formal [3+2] annulation strategy.
Catalytic Asymmetric Michael Addition/Cyclization of Isothiocyanato Oxindoles: Highly Efficient and Versatile Approach for the Synthesis of 3,2′-Pyrrolidinyl Mono- and Bi-spirooxindole Frameworks
作者:Yi-Ming Cao、Fang-Fang Shen、Fu-Ting Zhang、Rui Wang
DOI:10.1002/chem.201204114
日期:2013.1.21
A‐spiro‐ing to greatness: The catalytic asymmetric Michael addition/cyclization of isothiocyanato oxindoles has been realized. This versatile approach provides an easy and highly efficient way to access not only the enantioselective synthesis of 3,2′‐pyrrolidinyl spirooxindole frameworks, but also the construction of enatiomerically enriched bi‐spirooxindoles containingthreecontiguous stereocenters
Exploration of A New Zwitterion: Phosphine-Catalyzed [2+1+2] Cycloaddition Reaction
作者:Yu-Ning Gao、Qin Xu、Yin Wei、Min Shi
DOI:10.1002/adsc.201700242
日期:2017.5.17
A new zwitterion generated from different electron‐deficient alkenes and phosphines has been designed and its reactivity was explored. We demonstrated that this new zwitterion directed a novel [2+1+2] cycloaddition reaction between vinylpyridines and isatin‐derived electron‐deficient alkenes, affording spirocyclopenteneoxindole derivatives containing three stereocenters in moderate to good yields with
Skeletal rearrangement through photocatalytic denitrogenation: access to C-3 aminoquinolin-2(1<i>H</i>)-ones
作者:Swati Singh、Gopal Chakrabortty、Sudipta Raha Roy
DOI:10.1039/d3sc04447e
日期:——
alternative method for the synthesis of 3-amino quinolin-2(1H)-one that overcomes the limitations of traditional methods by editing the molecular skeleton via a cascade C–N bond formation and denitrogenation process. We used TMSN3 as an aminating agent and a wide variety of 3-ylideneoxindoles as synthetic precursors for the quinolin-2(1H)-one backbone, which demonstrates remarkable tolerance of sensitive
将胺基添加到杂芳族系统中是一项具有挑战性的合成过程,但它是许多生物活性分子开发中必不可少的过程。在这里,我们报告了一种合成 3-氨基喹啉-2(1 H )-one 的替代方法,该方法通过级联 C-N 键形成和脱氮过程编辑分子骨架,克服了传统方法的局限性。我们使用 TMSN 3作为胺化剂,并使用多种 3-亚叉吲哚作为 quinolin-2(1 H )-one 主链的合成前体,这对敏感官能团具有显着的耐受性。对照实验表明三唑啉中间体在产物的形成中起重要作用。光谱研究进一步确定了潜在的反应途径。