A HIGHLY PRACTICAL ROUTE TO 2-METHYLCHROMONES FROM 2-ACETOXYBENZOIC ACIDS
摘要:
2-Methylchromones were accessed via a keto ester condensation on 2-acetoxybenzoyl chloride, followed by cyclization and decarboxylation. No column chromatography was required in the process.
A HIGHLY PRACTICAL ROUTE TO 2-METHYLCHROMONES FROM 2-ACETOXYBENZOIC ACIDS
摘要:
2-Methylchromones were accessed via a keto ester condensation on 2-acetoxybenzoyl chloride, followed by cyclization and decarboxylation. No column chromatography was required in the process.
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
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