Isocyanide-Based Multicomponent Reactions: Concise Synthesis of Spirocyclic Oxindoles with Molecular Complexity by Using a [1,5]-Hydrogen Shift as the Key Step
作者:Shikuan Su、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1002/chem.201402576
日期:2014.5.12
concise multicomponentreaction of isocyanide, α‐substituted allenoate, and methyleneindolinone has been disclosed. This protocol provides a fast and straightforward approach to synthesize unusual tricyclic oxindoles in an efficient and atom‐economic manner. Mechanistically, the present cycloaddition may proceed through a cascadesequence involving double Michael addition, double cyclization, double
Organocatalyzed [2+2] Cycloaddition Reactions between Quinone Imine Ketals and Allenoates
作者:Teng Liu、Chao Huang、Feixiang Cheng、Chixian He、Fan Wang、Xiang Shen、Yongqin Li、Man Lang、Guijun Li
DOI:10.1055/s-0040-1707292
日期:2021.2
Abstract A new cycloaddition reaction of quinone imine ketals (QIKs), which could be utilized to the construction of functionalized azaspirocyclics under mild conditions, is described. This transformation involved a [2+2] cycloaddition reactionbetween QIKs and allenoates catalyzed by DABCO, and then treatment with 1 N HCl in one-pot. The strategy could provide a practical route to access azetidine-fused
申请人:The Board of Regents of the Nevada System of Higher Education on Behalf of the Unive. of Nevada
公开号:US20180118770A1
公开(公告)日:2018-05-03
Provided herein are N-heterocyclic phosphines (NHPs) useful in metal-free phosphorus-carbon bond forming reactions. Methods for preparing vinylphosphonates using NHPs also are provided. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
Utility of Bifunctional <i>N</i>-Heterocyclic Phosphine (NHP)-Thioureas for Metal-Free Carbon–Phosphorus Bond Construction toward Regio- and Stereoselective Formation of Vinylphosphonates
作者:Karimulla Mulla、Kyle L. Aleshire、Paul M. Forster、Jun Yong Kang
DOI:10.1021/acs.joc.5b02184
日期:2016.1.4
practical protocol for completely regioselective and highly stereoselective synthesis of vinyldiazaphosphonates from N-heterocyclic phosphine (NHP) and allenes via phospha-Michael/intramolecular nucleophilic substitution reaction has been developed. This transformation enabled the synthesis of valuable densely functionalized vinyldiazaphosphonates with a β-, γ-unsaturated ester moiety under mild reaction
Diastereoselective Synthesis of Tetracyclic Tetrahydroquinoline Derivative Enabled by Multicomponent Reaction of Isocyanide, Allenoate, and 2-Aminochalcone
作者:Zhishuang Wang、Youwen Fei、Chongrong Tang、Lei Cui、Jie Shen、Kun Yin、Shanya Lu、Jian Li
DOI:10.1021/acs.orglett.1c00912
日期:2021.6.4
We report here a multicomponent protocol to assemble several polycyclic dihydropyran-fused tetrahydroquinoline structures with excellent diastereoselectivity. This procedure employs simple feedstocks to accomplish a series of diverse structures, which is difficult to attain by traditional sequences.