Controllable Rh(III)-Catalyzed Annulation between Salicylaldehydes and Diazo Compounds: Divergent Synthesis of Chromones and Benzofurans
作者:Peng Sun、Shang Gao、Chi Yang、Songjin Guo、Aijun Lin、Hequan Yao
DOI:10.1021/acs.orglett.6b03355
日期:2016.12.16
A Rh(III)-catalyzed annulation between salicylaldehydes and diazocompounds with controllable chemoselectivity is described. AgNTf2 favored benzofurans via a tandem C–H activation/decarbonylation/annulation process, while AcOH led to chromones through a C–H activation/annulation pathway. The reaction exhibited good functional group tolerance and scalability. Moreover, only a single regioisomer of benzofuran
Regioselective synthesis of multisubstituted isoquinolones and pyridones via Rh(<scp>iii</scp>)-catalyzed annulation reactions
作者:Liangliang Shi、Ke Yu、Baiquan Wang
DOI:10.1039/c5cc05977a
日期:——
A mild and efficient Rh(III)-catalyzedregioselective synthesis of isoquinolones and pyridones has been developed. The protocol uses readily available N-methoxybenzamide or N-methoxymethacrylamide and diazo compounds as the starting materials. The...
Amino-modified Merrifield resins as recyclable catalysts for the safe and sustainable preparation of functionalized α-diazo carbonyl compounds
作者:Mariane Fantinel、Nayara Valiati、Pedro A.M. Moro、Marcus M. Sá
DOI:10.1016/j.tet.2021.132081
日期:2021.4
catalytic activity. This straightforward procedure can be readily scaled up to gram scale, enabling the wide application of this method. The synthetic potential was demonstrated through the two-step preparation of 2-amino-N-dodecylacetamide (ANDA), a small molecule of commercial relevance.
Cp*Ir(III)-Catalyzed C–H/O–H Functionalization of Salicylaldehydes for the Synthesis of Chromones at Room Temperature
作者:Dhanaji M. Lade、Yogesh N. Aher、Amit B. Pawar
DOI:10.1021/acs.joc.9b01139
日期:2019.7.19
C–H/O–H-bond functionalization of salicylaldehydes with α-diazocarbonyl compounds for the synthesis of chromones under redox-neutral conditions. The reaction proceeds at roomtemperature and displays excellent functional group tolerance along with high yields of the corresponding products. The developed reaction protocol was successfully applied for the late-stage functionalization of estrone derivative
Cp*Ir(<scp>iii</scp>)-catalyzed C–H/N–H functionalization of sulfoximines for the synthesis of 1,2-benzothiazines at room temperature
作者:Yogesh N. Aher、Dhanaji M. Lade、Amit B. Pawar
DOI:10.1039/c8cc03288b
日期:——
The first Cp*Ir(III)-catalyzed C–H/N–H bond functionalization of sulfoximines with α-diazocarbonyl compounds has been developed for the synthesis of 1,2-benzothiazines under redox-neutral conditions. The reactions proceed at roomtemperature with excellent functional group tolerance and high yields without the requirement of any silver additive.