Application of directed metalation in synthesis. Part 8: Interesting example of chemoselectivity in the synthesis of thioaurones and hydroxy ketones and a novel anionic ortho-Fries rearrangement used as a tool in the synthesis of thienopyranones and thiafluorenones
摘要:
Chemoselective synthesis of thioaurones or 3-hydroxy benzo[b]thiophen-2-aryl ketones, 1-hydroxy naphtho[2,1-b]thiophen-2aryl ketones and chalcones from N,N-diethyl-ortho-methyl sulfanyl aryl amides were described. (Benzo[b]thiophen-2-yl) alkylates and (naphtho[2, 1-b]thiophen-2-yl) alkylates undergo a novel anionic ortho-Fries rearrangement leading to (3-hydroxy benzo[b]thiophen-2-yl) and (1-hydroxy naphtho[2, 1 -b]thiophen-2-yl) alkyl ketones. The hydroxy ketones were used as intermediates in the synthesis of wide range of benzothienopyranones and thiafluorenones. (c) 2005 Elsevier Ltd. All rights reserved.
311. The formation of hydroxythionaphthens by the interaction of benzenesulphonylbenzisothiazolone and substances containing a reactive methylene group
作者:A. W. H. Barton、E. W. McClelland
DOI:10.1039/jr9470001574
日期:——
McClelland et al., Journal of the Chemical Society, 1948, p. 81,84
作者:McClelland et al.
DOI:——
日期:——
Krollpfeiffer; Schneider, Chemische Berichte, 1928, vol. 61, p. 1287,1288