of group-VIII metal catalysts has been examined in the hydrogenation of nonconjugated enones at ambient temperature under an atmospheric pressure of hydrogen. A cobalt catalyst gave high yields of unsaturated alcohols from trialkylated olefinic ketones. Osmium showed the highest selectivity among platinum metal catalysts for the reduction of the carbonyl bond in the hydrogenation of trialkylated olefinic
Asymmetric synthesis of a highly functionalized bicyclo[3.2.2]nonene derivative
作者:Toshiki Tabuchi、Daisuke Urabe、Masayuki Inoue
DOI:10.3762/bjoc.9.74
日期:——
The stereoselective Diels-Alder reaction between an optically active 1,4-dimethylcycloheptadiene and acrolein was effectively promoted by TBSOTf to produce a bicyclo[3.2.2]nonene derivative bearing two quaternary carbons. Seven additional transformations from the obtained bicycle delivered the C 2-symmetric bicyclo[3.3.2]decene derivative, a key intermediate in our synthetic study of ryanodine.
Ni-catalyzed migratory β-selective hydroarylation and hydroalkenylation of alkenyl ketones and alkenyl azahetereoarenes have been realized with aryl boronicacids using alkyl halide as the mild hydride source. This reaction features mild conditions, broad substrate scope and incredible heterocycle compatibility, providing a variety of β-aryl or -alkenyl ketones or heteroarenes in moderate to high yields