A facile and convenient synthesis of acetic nitronic anhydrides from aliphatic nitroalkenes and lithium ketone enolates and the efficient conversion of these anhydrides to 1,4-diketones, alkylpyrroles, diketone monooximes, dihydro-1,2-oxazines, pyrrolidines, 2-hydroxypyrrolidines, and 1-pyrrolines are recorded.
The Lewis acid-catalyzed reaction of nitro olefins and ketene methyl trimethylsilyl acetals afforded methyl 4-oxo-carboxylates on hydrolysis of the resulting adducts followed by treatment with diazomethane.
Organosilicon-mediated total synthesis of the triquinane sesquiterpenes (±)-β-isocomene and (±)-isocomene
作者:Arndt W. Schmidt、Thomas Olpp、Elke Baum、Tina Stiffel、Hans-Joachim Knölker
DOI:10.1039/c0ob00051e
日期:——
We describe an efficient totalsynthesis of the sesquiterpenes (±)-β-isocomene and (±)-isocomene using a Lewis acid-promoted [3 + 2] cycloaddition of allyl-tert-butyldiphenylsilane as the key-step.
Construction of Multisubstituted Tetrahydropyrans by a Domino Oxa-Michael/Tsuji–Trost Reaction
作者:Liang Wang、Dirk Menche
DOI:10.1021/jo302102x
日期:2012.12.7
Biologically significant tetrahydropyrans (THP) were synthesized by a Tandemoxa-Michael/Tsuji–Trostreaction. Different Michael acceptors were investigated, and optimal results in terms of diastereoselectivities and yields were obtained with nitro olefins. The influence of the reaction parameters, substrate patterns, and type of metal counterions on the yield and stereochemical outcome of this process
Synthesis of Highly Substituted Phenols and Benzenes with Complete Regiochemical Control
作者:Xiaojie Zhang、Christopher M. Beaudry
DOI:10.1021/acs.orglett.0c02157
日期:2020.8.7
Substitutedphenols are requisite molecules for human health, agriculture, and diverse synthetic materials. We report a chemical synthesis of phenols, including penta-substituted phenols, that accommodates programmable substitution at any position. This method uses a one-step conversion of readily available hydroxypyrone and nitroalkene starting materials to give phenols with complete regiochemical