Enzymes in organic synthesis. 46. Regiospecific and stereoselective horse liver alcohol dehydrogenase catalyzed reductions of cis- and trans-bicyclo[4.3.0]nonanones
Improved Dienophilicity of Nitrocycloalkenes: Prospects for the Development of a <i>trans</i>-Diels−Alder Paradigm
作者:Woo Han Kim、Jun Hee Lee、Samuel J. Danishefsky
DOI:10.1021/ja9058926
日期:2009.9.9
The development of an efficient and stereoselective trans-Diels-Alder paradigm is described. A central element of this transformation is the introduction of a temporary dienophilic functionality (A), which serves both to activate the substrate for Diels-Alder cycloaddtion and, through its subsequent removal, to facilitate conversion of the cis-fused cycloadducts to the trans-fused series.
Palladium assisted transfer hydrogenation of cyclic α,β-unsaturated ketones by ammonium formate
作者:H.Surya Prakash Rao、K.Subba Reddy
DOI:10.1016/0040-4039(94)88193-6
日期:1994.1
α,β-Unsaturatedketones can be hydrogenated conveniently under catalytic transferhydrogenation conditions using ammoniumformate / Pd-C (10 %) in refluxing methanol.