作者:Marvin Parasram、Viktor O. Iaroshenko、Vladimir Gevorgyan
DOI:10.1021/ja5104525
日期:2014.12.31
A palladium (Pd)-catalyzed endo-selectiveHeckreaction of iodomethylsilyl ethers of phenols and aliphatic alkenols has been developed. Mechanistic studies reveal that this silyl methyl Heckreaction operates via a hybrid Pd-radical process and that the silicon atom is crucial for the observed endo selectivity. The obtained allylic silyloxycycles were further oxidized into (Z)-alkenyldiols.
Synthesis of substituted 2<i>H</i>[1]benzopyrans from coumarins and chromones
作者:A. Alberola、A. González Ortega、R. Pedrosa、J. L. Pérez Bragado、J. F. Rodríguez Amo
DOI:10.1002/jhet.5570200341
日期:1983.5
A convenient route to substituted 2H[1]benzopyrans is described in which trialkylaluminium compounds are added to coumarins or chromones and the resultant Z-2-(3-hydroxy-1-propenyl)phenols are converted by thermal cyclization in the presence of silica gel to 2H[l]benzopyrans.
描述了一种取代2 H [1]苯并吡喃的简便方法,其中将三烷基铝化合物添加到香豆素或色酮中,并在二氧化硅存在下通过热环化反应将生成的Z -2-(3-羟基-1-丙烯基)苯酚转化凝胶至2 H [1]苯并吡喃。
The synthesis of a series of (3-hydroxyprop-1-enyl)-substituted 1-(aryloxy)-3-(alkylamino)propan-2-ols is described. These compounds were investigated for their beta-adrenoreceptor blocking properties and their selective of action. Among the o-(hydroxypropenyl)-substituted derivatives we have found some potent noncardioselective beta-adrenoreceptor blocking agents which have a greater blocking action
The sodiumborohydridereduction of coumarin to the corresponding alkanol and alkenol has been investigated in the presence and absence of β-cyclodextrin (β-CD). Excellent selectivity is observed when β-CD-coumarin complex is reduced in solid state at 0°C and the alkenol, cis-o-hydroxycinnamyl alcohol is the major product. Complex formation and the mode of substrate insertion into the CD cavity have