A Garratt–Braverman route to aryl naphthalene lignans
作者:Sayantan Mondal、Manasi Maji、Amit Basak
DOI:10.1016/j.tetlet.2011.01.011
日期:2011.3
A series of aryl naphthalene lignans were prepared in good yields starting from substituted bis-propargyl ethers. The method involved a base-mediated Garratt-Braverman cyclization followed by benzylic oxidation to the lactone. The chemoselectivity in the GB cyclization and the regioselectivity in the benzylic oxidation could be achieved by controlling the electronic nature of the aryl-substituents as well as by changing the substitution pattern of the two aryl rings. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of Arylnaphthalene Lignan Scaffold by Gold-Catalyzed Intramolecular Sequential Electrophilic Addition and Benzannulation
作者:Vanajakshi Gudla、Rengarajan Balamurugan
DOI:10.1021/jo201918d
日期:2011.12.16
an arylnaphthalene lignan scaffold in high yields is presented. It involves a sequential intramolecular electrophilic attack of carbonyl on arylalkyne followed by benzannulation catalyzed by gold salt. AuCl3 in combination with AgSbF6 works better to effect this transformation. Selected products have been converted into arylnaphthalene lactone natural products such as justicidin E, taiwanin C, and