Citation:
Zhi-Wei Chen, Na Zhang, Zhi-Hua Wang, Wei-Ke Su. An efficient synthesis of novel chromeno[3’, 4’:5, 6]pyrano[2, 3-b]indole derivatives[J]. Chinese Chemical Letters,
;2013, 24(3): 199-201.
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An efficient two-step method was described for the synthesis of chromeno[3',4':5,6]pyrano[2,3-b]indole derivatives. The three-component reaction of 4-hydroxycoumarin, variously substituted benzaldehydes and indolin-2-one was promoted by P2O5 in refluxing ethanol to give trimolecular adducts, which were then cyclized in 1,2-dichloroethane under reflux using POCl3.
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