A Facile Synthesis of Isocoumarino[3’,4’:4,5]pyrrolo[3,2-c]coumarins from 4-Aminocoumarins and Ninhydrin
摘要:
An efficient method for the synthesis of novel isocoumarino-[3',4':4,5]pyrrolo[3,2-c]-coumarins was described. The construction of this new fused heterocycles system was achieved undergo a domino reaction of 4-aminocoumarins with ninhydrin in good yields.
A Convenient Approach to the Synthesis of Dialkyl 5‐Oxo‐1,2‐dihydro‐5H‐chromeno [4,3‐b]pyridine‐2,3‐dicarboxylates
摘要:
Coumarin and its analogs are considered privileged scaffolds in the current synthetic and pharmacological research. The chemical behavior of enaminocarbaldehydes of the coumarin moiety under intramolecular Wittig reaction conditions in the presence of triphenylphosphine and dimethyl or diethyl acetylenedicarboxylates has been studied, resulting in the isolation of a series of dimethyl and diethyl 5-oxo-1,2-dihydro-5H-chromeno[4,3-b]pyridine-2,3-dicarboxylates in good to high yields.
Synthesis and characterization of coumarin and dimedone-derived diazabicycles
作者:Jiun-Ting Lai、Pei-Yu Kuo、Yung-Her Gau、Ding-Yah Yang
DOI:10.1016/j.tetlet.2007.09.006
日期:2007.10
synthesis involved the acid-catalyzed coupling of 4-aminocoumarin or dimedone derivatives with amino alcohols 3 or 7 to give the ring-opened forms 4, 10, 12 and the ring-closed diazabicycles 5, 6, 9, 11. When 4-alkylaminocoumarins were used as the coupling reagents, the majorcyclizedproduct was N-dealkylated diazabicycle 5, rather than the corresponding N-alkylated products. Alternatively, compound