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  • Title: One-pot three-component synthesis of pyrano [3,2-b]pyrazolo[4,3-e]pyridin-8(1H)-ones.
    Author: Safaei S, Mohammadpoor-Baltork I, Khosropour AR, Moghadam M, Tangestaninejad S, Mirkhani V, Khavasi HR.
    Journal: ACS Comb Sci; 2013 Mar 11; 15(3):141-6. PubMed ID: 23406379.
    Abstract:
    An efficient one-pot synthesis of novel pyrano[3,2-b]pyrazolo[4,3-e]pyridin-8(1H)-ones via three-component condensation of kojic acid, 1-H-pyrazol-5-amines and aldehydes in the presence of a catalytic amount of Zn(OTf)(2) followed by H(2)O(2)-mediated oxidation is reported. Furthermore, the synthesis of 1'H-spiro[indoline-3,4'-pyrano[2,3-b]pyrazolo[3,4-e]pyridine]-2,8'(9'H)-diones were chosen for the library validation.
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