A Highly Diastereo- and Enantioselective Hg(II)-Catalyzed Cyclopropanation of Diazooxindoles and Alkenes
作者:Zhong-Yan Cao、Feng Zhou、Yi-Hua Yu、Jian Zhou
DOI:10.1021/ol302998m
日期:2013.1.4
It is reported for the first time that Hg(II) can catalyze the cyclopropanation of diazo reagents and alkenes, which contributes to the unprecedented highlydiastereo- and enantioselective synthesis of spirocyclopropyloxindoles.
Synthesis of Isatin‐Hydrazones from 3‐Diazo Oxindoles and Sulfoxonium Ylides under Catalyst‐ and Additive‐Free Conditions
作者:Yu Tian、Zunting Zhang、Tao Wang
DOI:10.1002/ejoc.202100060
日期:2021.3.12
A facile synthesis of isatin‐hydrazones from 3‐diazo oxindoles and sulfoxonium ylides undercatalyst‐ and additive‐freeconditions was reported. The reaction has a broad substrate scope, affording a variety of products with good yields (42–95 %). The mechanism for the formation of the products was also investigated.
Gold(I)-Catalyzed Dimerization of 3-Diazooxindoles towards Isoindigos
作者:Xinbo Yao、Tao Wang、Zunting Zhang
DOI:10.1002/ejoc.201800809
日期:2018.8.31
Isoindigos were prepared via a gold‐catalyzed dimerization of 3‐diazooxindoles. Besides a broad substrate scope and functional group tolerance, the reaction also exhibited high efficiency on a gram‐scale reaction.
3-allyl/3-allenyl-3-(thio)oxindole core remains a challenge in organic synthesis. Herein, we report a novel Rh2(esp)2 catalytic Doyle–Kirmse reaction to furnish the oxindole core, bearing unbiased NH as well as a quaternary stereogenic center at the 3-position, in good to excellent yields under mild conditions. These reactions are concise, practical, atom-economic, and highly efficient, and feature a TON
possess 3-allyl and 3-amino simultaneously, was first achieved by employing an intermolecular [2,3]-sigmatropic rearrangementreaction between diazooxindoles and tertiary allylic amines. Utilizing readily available allylamines as the nitrogen and allyl source concurrently, a wide range of bio-active 3-allyl-3-(amino)oxindoles were obtained in excellent yields under very mild reaction conditions; meanwhile