Cp*Rh<sup>III</sup>
-Catalyzed Directed Amidation of Aldehydes with Anthranils
作者:Suvankar Debbarma、Modhu Sudan Maji
DOI:10.1002/ejoc.201700457
日期:2017.7.7
towards construction of amide C–N bonds under mild conditions through rhodium(III) catalysis has been explored. Previous waste-free amidations were generally limited to the condensation of carboxylic acids and amines. In this report, we directly applied amination of the aldehyde C(sp2)–H bond to extend the scope of amidation reactions. The amination shows a wide substratesscope, and several important
Intramolecular hydrogen-bonding-assisted phosphine-catalysed [3 + 2] cyclisation of ynones with <i>o</i>-hydroxy/amino benzaldehydes
作者:Zhi-Xiong Deng、Zhen-Zhen Xie、Yu Zheng、Jun-An Xiao、Rui-Jia Wang、Hao-Yue Xiang、Hua Yang
DOI:10.1039/c9ob00056a
日期:——
tetrahydrofuran derivatives was developed via a phosphine-catalysed [3 + 2] cyclization reaction of aromatic aldehydes with 4-phenylbut-3-yn-2-one. This is the first example of intermolecularcyclization of ynones with benzaldehydes, which essentially benefited from the intramolecular hydrogen bonding. This new protocol features a broad substrate scope, mild reaction conditions, operational simplicity and easy scale-up
Synthesis of 1,2-Dihydroquinolines via Hydrazine-Catalyzed Ring-Closing Carbonyl-Olefin Metathesis
作者:Yunfei Zhang、Jae Hun Sim、Samantha N. MacMillan、Tristan H. Lambert
DOI:10.1021/acs.orglett.0c02116
日期:2020.8.7
The synthesis of 1,2-dihydroquinolines by the hydrazine-catalyzed ring-closing carbonyl-olefin metathesis (RCCOM) of N-prenylated 2-aminobenzaldehydes is reported. Substrates with a variety of substitution patterns are shown. With an acid-labile protecting group on the nitrogen atom, in situ deprotection and autoxidation furnish quinoline. In comparison with related oxygen-containing substrates, the
enantioselective decarboxylative [4 + 2]-annulation of ethynyl benzoxazinanones with azlactones has been developed under cooperative copper and bifunctional tertiary aminourea catalysis. This direct and modular approach combines dipolar copper-allenylidene intermediates with azlactone enolates and allows for the synthesis of α-quaternary α-acylaminoamides as a single diastereomer generally in high yields
The copper‐catalyzed decarboxylative [3+2] annulation of ethynylbenzoxazinanones with 3‐oxo‐3‐arylpropanenitriles has been developed, producing tetrasubstituted furan derivatives in moderate to high yield. This reaction was generally compatible with a wide range of substrates. Notably, the intermediate copper‐allenylidenes worked as a C2 synthon in the cycloaddition reaction.