The first synthesis of tetracyclic isoflavone wrightiadione 1 was achieved through the benzylic oxidation of the key intermediate isoflavone 2 which in turn could be obtained by condensation of 2-indanone with methyl salicylate and LDA.
Preparation of Benz[<i>b</i>]Indeno[1,2-<i>e</i>]Pyran-11(6<i>H</i>)-Ones and Benz[<i>b</i>]Indeno[1,2-<i>e</i>]Thiopyran-11(6<i>H</i>)-One from Dilithiated 2-Indanone and Lithiated Methyl Salicylates or Lithiated Methyl Thiosalicylate
作者:Jessica D. Townsend、Angela R. Williams、April J. Angel、Anne E. Finefrock、Charles F. Beam
DOI:10.1080/00397910008087371
日期:2000.2
Abstract Dilithiated 2-indanone was prepared with excess lithium diisopropylamide, and the resulting intermediate was condensed with several lithiated methylsalicylates or lithiated methylthiosalicylate, which was followed by acid cyclization to benz[b]indeno[1,2-e]pyran-11(6H)-ones 3--9 or benz[b]indeno[1,2-e]thiopyran-11(6H)-one 10, which are rare fused-ring indeno-chromones and a new indeno-thiochromone
The first synthesis of tetracyclic isoflavone wrightiadione 1 was achieved through the benzylic oxidation of the key intermediate isoflavone 2 which in turn could be obtained by condensation of 2-indanone with methyl salicylate and LDA.