Copper-promoted [2+2+2] annulation of 1,n-enynes through decomposition of azobis(alkyl nitrile)s.
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DOI: 10.1039/c6cc09063j
Abstract: A novel copper-promoted [2+2+2] annulation of 1,n-enynes with azobis(alkyl nitrile)s and H2O for the synthesis of diverse 7,8-dihydrophenanthridine-6,9(5H,6aH)-diones and fluorene is described. The reaction proceeds via the decomposition of azobis(alkyl nitrile)s into the cyanoalkyl radicals… read more here.
Keywords: copper promoted; promoted annulation; annulation enynes; decomposition azobis ... See more keywords
Construction of a 2,2'-biazulene framework via Brønsted acid-promoted annulation of 2,3-di(1-azulenyl)benzofurans.
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DOI: 10.1039/d3cc00373f
Abstract: Dibenzofurans featuring a 2,2'-biazulene framework were prepared in good yields by Brønsted acid-promoted annulation of 2,3-di(1-azulenyl)benzofurans in 100% H3PO4. NMR, UV-Vis, and fluorescence spectroscopies were used to investigate the structural and optical properties of the… read more here.
Keywords: azulenyl benzofurans; biazulene framework; acid promoted; nsted acid ... See more keywords