在
air 作用下,
以
甲苯 为溶剂,
反应 3.0h,
以74%的产率得到3-hydroxy-3-(4-methylphenyl)-5-methyl-indolin-2-one
参考文献:
名称:
N-Heterocyclic Carbene-Palladium(II)-1-Methylimidazole Complex Catalyzed α-Arylation of Oxindoles with Aryl Chlorides and Aerobic Oxidation of the Products in a One-Pot Procedure
摘要:
NHC-Pd(II)-Im complex 1 was found to be an effective catalyst for the alpha-arylation of unprotected oxindoles with aryl chlorides to give products 4 in 44-98% yields under a N-2 atmosphere. Furthermore, if the reactions were first performed under conditions identical to those for the alpha-arylation reaction for 12 hand then exposed to air for another 3 h, 3-aryl-3-hydroxy-2-oxindoles 5 can be obtained in 49-84% yields In a one-pot procedure.
The field of asymmetric catalysis has been developed by exploring noncovalent interactions, particularly within N-heterocyclic carbene-mediated processes. Despite challenges due to the limited number of compatible electrophiles (predominantly π-acceptors), this study introduces the first asymmetric α-alkylation of 3-aryl oxindoles using Csp3 electrophiles. The innovative protocol integrates diverse
不对称催化领域是通过探索非共价相互作用而发展起来的,特别是在 N-杂环卡宾介导的过程中。尽管由于相容亲电子试剂(主要是 π 受体)数量有限而面临挑战,本研究首次使用 C sp3亲电子试剂对 3-芳基羟吲哚进行不对称 α-烷基化。该创新方案集成了多种羟吲哚和烷基、烯丙基和炔丙基亲电子试剂,实现了高产率和对映选择性。初步的机理探索支持非共价催化机制,增强了构建具有潜在应用的复杂手性分子的工具包。
Cinchona Alkaloid Catalyzed Enantioselective Fluorination of Allyl Silanes, Silyl Enol Ethers, and Oxindoles
enantioselective hydroxylation reaction of both 3-aryl and 3-alkyl-2-oxindoles using the DBFOX-Zn(II) complex, leading to pharmaceutically important chiral 3-hydroxy-2-oxindoles was described. The structure of oxidant was found to play an important role to increase the enantioselectivity. The methodology has successfully applied to the highly enantioselective hydroxylation of beta-keto esters using the DBFOX-Ni(II)
<i>N</i>-Heterocyclic Carbene-Palladium(II)-1-Methylimidazole Complex Catalyzed α-Arylation of Oxindoles with Aryl Chlorides and Aerobic Oxidation of the Products in a One-Pot Procedure
作者:Zheng-Kang Xiao、Hui-Ying Yin、Li-Xiong Shao
DOI:10.1021/ol400186b
日期:2013.3.15
NHC-Pd(II)-Im complex 1 was found to be an effective catalyst for the alpha-arylation of unprotected oxindoles with aryl chlorides to give products 4 in 44-98% yields under a N-2 atmosphere. Furthermore, if the reactions were first performed under conditions identical to those for the alpha-arylation reaction for 12 hand then exposed to air for another 3 h, 3-aryl-3-hydroxy-2-oxindoles 5 can be obtained in 49-84% yields In a one-pot procedure.