A simpleone-potprocedure for the direct reductive amination of aldehydes using lithium powder and a catalytic amount of 4,4′-di-tert-butylbiphenyl (DTBB) or a polymer supported naphthalene as reducing system is described. The direct reductive amination of a variety of aldehydes with primary amines was achieved simply by adding a mixture of the corresponding carbonyl compound and the amine, over a
Arene Chromium Tricarbonyl Catalyzed Reactions in Organic Synthesis
作者:Mikiko Sodeoka、Masakatsu Shibasaki
DOI:10.1055/s-1993-25917
日期:——
Arene chromium tricarbonyl complexes have been widely used in synthetic organic chemistry. In this article, catalytic activities of these complexes in hydrogenation and isomerization are discussed. Furthermore, their application to the syntheses of biologically significant compounds such as prostaglandins, sex pheromones and antitumor antibiotics is also reviewed. 1. Introduction 2. Hydrogenation of Conjugated Dienes 2.1. Catalytic Activity and Reaction Mechanism 2.2. Application to Organic Synthesis 2.2.1. Stereocontrol of Acyclic Olefins 2.2.2. Stereocontrol of Exocyclic Olefins 3. Scope and Limitation of Arene · Cr(CO)3 as a Hydrogenation Catalyst 3.1. Hydrogenation of Alkynes 3.2. Hydrogenation of Enones 3.3. Hydrogenation of Other Functional Groups 4. Isomerization of Conjugated Dienes 4.1. Stereocontrolled 1,5-Hydrogen Shift of Conjugated Dienes 4.2. Application to Organic Synthesis 5. Conclusion and Outlook