Construction of polycyclic structures with vicinal all-carbon quaternary stereocenters <i>via</i> an enantioselective photoenolization/Diels–Alder reaction
present in one molecule, they will dramatically increase its synthetic challenge. A chiral titanium promoted enantioselective photoenolization/Diels–Alder (PEDA) reaction allows largely stereohindered tetra-substituted dienophiles to interact with highly active photoenolized hydroxy-o-quinodimethanes, delivering fused or spiro polycyclic rings bearing vicinal all-carbon quaternary centers in excellent
Cyclization of 1,3-disubstituted 2-(3-butenyl)-2-cyclohexen-1-ols
作者:E.-J. Brunke、F.-J. Hammerschmidt、H. Struwe
DOI:10.1016/s0040-4020(01)97681-1
日期:1981.1
The cationic cyclization of cyclohexenols 8a-c gave mixtures of the octalinols 9a-c and 10a-c with 9a-c as main products. By cyclization of the isomeric educts 13a-c, the same products were formed in different proportions.
A method of using organic compounds and providing slow release flavoring in or for food products wherein flavor precursors are added to flavor compositions and/or food products and release flavor compounds upon consumption of the food products, and novel flavor precursor compounds. The flavor precursors can be prepared from monoglycerides and flavor compounds which comprise one or more carbonyl groups.