A facile access to indene frameworks through condensation of substituted cinnamylaldehydes and sulfonylamines under the catalysis of FeCl3 is reported.
通过FeCl3催化下,报告了通过取代的肉桂醛和磺酰胺的缩合轻松获得茚骨架。
Reaction of α,β-unsaturated aldehydes with hydrogen peroxide catalysed by benzeneseleninic acids and their precursors
作者:Ludwik Syper
DOI:10.1016/s0040-4020(01)86890-3
日期:1987.1
Oxidation of α,β-unsaturated aldehydes with hydrogenperoxide catalysed by benzeneseleninic acids and their precursors has been investigated. Bis 2-nitrophenyl diselenide has proved to be the most effective catalyst. The major products resulting from the oxidation are vinyl formates (a) which on hydrolysis give saturated aldehydes or ketones (g) having the carbon chain shortened by one carbon atom
and diastereoselective [3 + 2] and [4 + 2] annulations of α,β-unsaturated imines with alkenes via allylic C(sp3)–H activation by half-sandwich rare-earth catalysts having different metal ion sizes. The reaction of α-methyl-substituted α,β-unsaturated aldimines with alkenes by a C5Me4SiMe3-ligated scandium catalyst took place in a trans-diastereoselective [3 + 2] annulation fashion via C(sp3)–H activation