Site Selectivity of the Diels−Alder Reactions of 3-[1-(tert-Butyldimethylsilyloxy)vin-1-yl]furan and 3-(Propen-2-yl)furan. Synthesis of 4-Substituted Benzofurans
摘要:
The Diels-Alder reaction of 5-vinylfurans 5 and 27 with DMAD, N-phenylmaleimide, and dimethyl maleate afforded products derived both from addition to the furan ring diene system (intraannular addition) and to the furan 2,3-double bond 3-vinyl group diene system (extraannular addition). For example, compounds 6 and 7 were obtained from 5 and DMAD. In contrast, dienophiles containing a phenylsulfinyl group, such as 19-21, gave products derived exclusively from the extraannular reaction mode. These products are useful precursors of 4-substituted benzofurans, especially 4-hydroxybenzofurans.
The reaction of benzenesulfenic acid, generated in situ by thermal decomposition of 3‐(phenylsulfinyl)propanenitrile, with monosubstitutedacetylenes was experimentally and theoretically investigated at the DFT level using the MPW1B95 density functional. A computational model based on the Hard Soft Acid Base (HSAB) principle was evaluated for its ability to qualitatively and quantitatively predict
Studies on the synthesis of solenolide f.; a cr(ii)-mediated cyclization to form the ten-membered ring
作者:Michael B. Roe、Mark Whittaker、Garry Procter
DOI:10.1016/0040-4039(95)01687-d
日期:1995.10
The fused 6-10 bicyclic framework common to the briarein diterpenoids has been constructed using a Cr(II)-mediated cyclization of an aldehyde-vinyl iodide precursor.
New acetylenic michael receptor equivalents,
作者:François Leyendecker、Marie-Thérèse Comte
DOI:10.1016/s0040-4039(00)85565-3
日期:1982.1
LEYENDECKER, F.;COMTE, M. -T., TETRAHEDRON LETT., 1982, 23, N 48, 5031-5034
作者:LEYENDECKER, F.、COMTE, M. -T.
DOI:——
日期:——
LEYENDECKER, F.;COMTE, M. -T., TETRAHEDRON, 1986, 42, N 5, 1413-1421