The first example of the [4+2] cycloaddition reaction of silylketenes with 1,3-dienes: A convenient preparation of 2-pyranones and isochromenes
作者:Tatsuya Ito、Toyohiko Aoyama、Takayuki Shioiri
DOI:10.1016/0040-4039(93)88111-u
日期:1993.10
Silylketenes easily undergo the [4+2] cycloaddition reaction with electron-rich 1,3-dienes and o-quinodimethanes to give the corresponding 2-pyranones and isochromenes, respectively.
Synthesis of 5,8-dimethoxynaphtho[2,3-c]furan-4(9H)-one
作者:Matthew J. Piggott、Dieter Wege
DOI:10.1016/j.tet.2006.01.096
日期:2006.4
The synthesis of the title compound, which shares its skeleton with a number of biologically active natural products, is described. The key steps are construction of a 3,4-disubstituted furan by a tandem Diels-Aider-retro-Diels-Alder reaction of an alkyne with 4-phenyloxazole, and an intramolecular Friedel-Crafts acylation. (c) 2006 Elsevier Ltd. All rights reserved.
CHARLTON, J. L.;DURST, T., TETRAHEDRON LETT., 1984, 25, N 25, 2663-2666