Addition of Diazo Compounds <i>ipso</i>-C–H Bond to Carbon Disulfide: Synthesis of 1,2,3-Thiadiazoles under Mild Conditions
作者:Lei Zhang、Beiqi Sun、Qianyi Liu、Fanyang Mo
DOI:10.1021/acs.joc.8b00383
日期:2018.4.6
We describe here an operationally simple and straightforward synthesis method for a series of diverse 4,5-disubstituted 1,2,3-thiadiazoles via the nucleophilic addition of α-diazo carbonyl compounds to carbon disulfide. This method features using abundant and inexpensive carbon disulfide undermild reaction conditions.
involve the corresponding metal carbenes as key intermediates. In this letter, a metal-free three-component intermolecular acetoxyaminoalkylation of α-diazo amides with tertiary aryl amines and (diacetoxyiodo)benzene is presented.
On-Water Cp*Ir(III)-Catalyzed C–H Functionalization for the Synthesis of Chromones through Annulation of Salicylaldehydes with Diazo-Ketones
作者:Suvankar Debbarma、Md Raja Sk、Biswabrata Modak、Modhu Sudan Maji
DOI:10.1021/acs.joc.9b00418
日期:2019.5.17
A high-valent Ir(III)-catalyzed C–H bond functionalization is carried out for the first time on water for the synthesis of a biologically relevant chromone moiety. The C–H activation and annulation of salicylaldehydes with diazo-compounds provided the desired chromones. The synthesis of C3-substitution-free chromones has also been demonstrated by a one-pot decarboxylation by employing tert-butyl diazoester
Regioselective Passerini and Passerini-Knoevenagel Reactions with<i>vic</i>-Diketo Amides
作者:Jan Roßbach、Klaus Harms、Ulrich Koert
DOI:10.1002/ejoc.201301548
日期:2014.2
The Passerinireaction of vic-diketo amides with a variety of isocyanides and carboxylic acids has been examined. α-Acyloxy β-keto carboxamides were formed regioselectively as the major products. For the Passerinireactions with electron-withdrawing-group-substituted acetic acids, a one-pot Passerini–Knoevenagelreaction was accomplished by the addition of triethylamine.
Synthesis of Indazoles by the [3+2] Cycloaddition of Diazo Compounds with Arynes and Subsequent Acyl Migration
作者:Zhijian Liu、Feng Shi、Pablo D. G. Martinez、Cristiano Raminelli、Richard C. Larock
DOI:10.1021/jo702062n
日期:2008.1.1
The [3+2] cycloaddition of a variety of diazocompounds with o-(trimethylsilyl)aryl triflates in the presence of CsF or TBAF at room temperature provides a very direct, efficient approach to a wide range of potentially biologically and pharmaceutically interesting substituted indazoles in good to excellent yields under mild reaction conditions. Simple diazomethane derivatives afford N-unsubstituted