Access to Spirocyclized Oxindoles and Indolenines via Palladium-Catalyzed Cascade Reactions of Propargyl Carbonates with 2-Oxotryptamines and Tryptamines
作者:Antoinette E. Nibbs、Thomas D. Montgomery、Ye Zhu、Viresh H. Rawal
DOI:10.1021/acs.joc.5b00277
日期:2015.5.15
through a process wherein the first nucleophilic unit on the oxindole or indole reacts with an allenyl-palladium species, formed from oxidative addition of Pd(0) to propargyl carbonates, to generate a π-allyl palladium intermediate that then reacts further with the second nucleophilic component of the oxindole or indole. The cascade process forges two bonds en route to spirocyclized oxindole and indolenine
Palladium-Catalyzed Modular Synthesis of Substituted Piperazines and Related Nitrogen Heterocycles
作者:Thomas D. Montgomery、Viresh H. Rawal
DOI:10.1021/acs.orglett.5b03708
日期:2016.2.19
We report here a novel method for the modular synthesis of highly substituted piperazines and related bis-nitrogen heterocycles via a palladium-catalyzed cyclization reaction. The process couples two of the carbons of a propargyl unit with various diamine components to provide nitrogen heterocycles in generally good to excellent yields and high regio- and stereochemicalcontrol.
Palladium(II)-Catalyzed Reaction of Lawsones and Propargyl Carbonates: Construction of 2,3-Furanonaphthoquinones and Evaluation as Potential Indoleamine 2,3-Dioxygenase Inhibitors
An efficient reaction utilizing propargyl carbonates through Claisen rearrangement to synthesize furanonaphthoquinones is described. The remarkable transformation exhibits excellent functional group tolerance, affording the target furanonaphthoquinones in moderate to good yields (41–85%) undermildreactionconditions. Scaled-up preparation of the model product can make this reaction a method of choice
Copper(II)-Catalyzed Tandem Reaction: Synthesis of Furo[3,2-<i>c</i>]coumarin Derivatives and Evaluation for Photophysical Properties
作者:Xi Feng、Zhen Qin、Xinying Cheng、Dongyu Liu、Yinghe Peng、Huidan Huang、Bin Song、Jinlei Bian、Zhiyu Li
DOI:10.1021/acs.joc.1c00835
日期:2021.9.17
An efficient protocol for synthesizing furo[3,2-c]coumarin derivatives is described. The novel reaction could afford the desired furocoumarins with good to excellent yields in a mild and rapid manner. Large substrate scope screening and scale-up preparation have also been accomplished, and selected compounds were evaluated for their photophysical properties.
描述了合成呋喃 [3,2- c ] 香豆素衍生物的有效方案。该新反应可以以温和快速的方式提供所需的呋喃香豆素,收率良好至极好。还完成了大型底物范围筛选和放大制备,并对选定的化合物的光物理特性进行了评估。
Gold(I)-Catalyzed Formation of 4-Alkylidene-1,3-dioxolan-2-ones from Propargylic <i>tert-</i>Butyl Carbonates
作者:Andrea Buzas、Fabien Gagosz
DOI:10.1021/ol053100o
日期:2006.2.1
[reaction: see text]. A study concerning the gold(I)-catalyzed rearrangement of propargylic tert-butyl carbonates into 4-alkylidene-1,3-dioxolan-2-ones is described. The mild reaction conditions employed allow the efficient synthesis of a variety of cyclic carbonates that would be less conveniently obtained using reported methods. Variability in the structure of the final product has been observed