Copper-Catalyzed Coupling of Amines with Carbazates: An Approach to Carbamates
作者:Song-Ning Wang、Guo-Yu Zhang、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1021/acs.joc.1c01031
日期:2021.7.2
A new approach for the preparation of carbamates via the copper-catalyzed cross-coupling reaction of amines with alkoxycarbonyl radicals generated from carbazates is described. This environmentally friendly protocol takes place under mild conditions and is compatible with a wide range of amines, including aromatic/aliphatic and primary/secondary substrates.
Iron(III)-catalyzed regioselective direct remote C–H carboxylation of naphthyl and quinoline amides was developed using CBr4 and alcohol. The reaction involves a radical pathway using a coordination activation strategy and single electron transfer process. The use of sustainable iron catalysis, selectivity, and the substrate scope are the important practical features.
Mn-mediated oxidative radical cyclization of 2-(azidomethyl)phenyl isocyanides with carbazate: access to quinazoline-2-carboxylates
作者:Gujjenahalli Ramalingaiah Yogesh Kumar、Noor Shahina Begum、Khan Mohammed Imran
DOI:10.1039/d0nj00479k
日期:——
Mn-TBHP mediated oxidative radicalcyclization of 2-(azidomethyl)phenyl isocyanides using methyl carbazate has been described. This procedure is realized through a cascade radical addition and aromatization process with high atom economy to furnish various heterocyclic C2 diversified quinazoline-2-carboxylate derivatives.
We report an environmentally benign protocol for the C–H alkoxycarbonylation of arenes with alkylcarbazates directed by N‐heterocyclic substituents. Pd(OAc)2 is used to catalyze this oxidative free radical carbonylative transformation. The reaction is tolerant to a wide variety of functional groups to give the products in good yields and excellent regioselectivity.
Reactions of allyloxy(methoxy)carbene in solution. Carbene rearrangement and Claisen rearrangement of the carbene dimer
作者:Damian Plazuk、John Warkentin、Nick Henry Werstiuk
DOI:10.1016/j.tet.2005.04.024
日期:2005.6
Allyloxy(methoxy)carbene, with and without deuterium in the α-position of the allyloxy group, was generated in benzene at 50 and at 110 °C. At the higher temperature, the carbene fragmented to allyl and methoxycarbonyl radicals that subsequently coupled. At the lower temperature, most of the carbene dimerised. The structure of the major product and the distribution of deuterium indicated that the dimer