Synthesis of 2,3-Dihydro-2-Ylidene-1,4-Benzodioxins

Author(s): Denis Sinou

Journal Name: Current Organic Chemistry

Volume 9 , Issue 4 , 2005

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The 2,3-dihydro-1,4-benzodioxin structure is present in compounds having some interesting biological properties. The first access to this structure, performed from 2-alkyl-1,4-benzodioxin or benzene-1,2-diol via stoechiometric cyclization, generally gave mixtures of products. Recently, the organometallic-catalyzed synthesis of this structure was performed using mercuric oxide, or more interesting, palladium as the catalyst. The palladiumcatalyzed heteroannulation of various monoprop-2-ynylated catechol and aryl iodides in the presence of PdCl2(PPh3)2 and CuI afforded the corresponding 1-alkylidene or 1-arylidene-2,3-dihydro-1,4-benzodioxins in excellent chemical yields. However the palladium-catalyzed cyclisation of substituted benzene-1,2-diols with different propargylic carbonates gave the corresponding 1-alkylidene or 1-arylidene-2,3-dihydro-1,4-benzodioxins eventually substituted at position 2 by an aryl or an alkyl group. Moreover, this later methodology seems very powerful since it is possible to perform this heteroannulation in an asymmetric way in order to obtain the 1-alkyl- 2-alkylidene-2,3-dihydro-1,4-benzodioxins in enantioselectivities up to 96%.

Keywords: eusiderin, eusideroxylon zwageri, sinaiticin, analgesic, 1,4-benzodioxan, diels-alder reaction, condensation

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Article Details

Year: 2005
Page: [377 - 387]
Pages: 11
DOI: 10.2174/1385272053174976
Price: $58

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