Candida antarctica B lipase catalysed resolution of (±)-1-(heteroaryl)ethylamines
摘要:
Candida antarctica B lipase is an efficient catalyst for the enantioselective acetylation of (+/-)-1-(heteroaryl)ethylamines (+/-)-1a-c. (C) 1997 Elsevier Science Ltd.
Asymmetric Synthesis of Chiral Primary Amines by Ruthenium-Catalyzed Direct Reductive Amination of Alkyl Aryl Ketones with Ammonium Salts and Molecular H<sub>2</sub>
amination of simple ketones. The strategy makes use of ammonium acetate as the amine source and H2 as the reductant and is a user-friendly and operatively simple access to industrially relevant primary amines. Excellent enantiocontrol (>90% ee for most cases) was achieved with a wide range of alkylarylketones. The practicability of this methodology has been highlighted by scalable synthesis of key intermediates
The monodentate phosphoramidite MonoPhos has been used in the rhodium-catalysed asymmetrichydrogenation of N-acetyl-α-arylenamides. This ligand is readilyavailable via a one-step procedure and is air stable. Its Rh(I) complex, which is an effective catalyst precursor for the hydrogenation of dehydroamino acids, also gives high enantioselectivities for this class of substrates. Because of the facile
Monodentate Phosphoramidites: A Breakthrough in Rhodium-Catalysed Asymmetric Hydrogenation of Olefins
作者:Michel van den Berg、Adriaan J. Minnaard、Robert M. Haak、Michel Leeman、Ebe P. Schudde、Auke Meetsma、Ben L. Feringa、André H. M. de Vries、C. Elizabeth P. Maljaars、Charlotte E. Willans、David Hyett、Jeroen A. F. Boogers、Hubertus J. W. Henderickx、Johannes G. de Vries
DOI:10.1002/adsc.200390026
日期:2003.1
ligands for the rhodium-catalysed asymmetrichydrogenation of olefins. Very high enantioselectivities were obtained with MonoPhos (7a) the simplest member of this class, a ligand that is prepared in a single step from BINOL and HMPT. Turnover numbers up to 6000 have been obtained in the hydrogenation of dehydroamino acid derivatives. Enantioselectivities in the hydrogenation of dehydroamino acids are solvent
A highly efficient Rh-catalyzed hydrogenation of functionalized olefins has been realized by a new family of highly rigid chiral ferrocenylphosphine-spiro phosphonamidite ligands. Excellent enantiocontrol (>99% ee in most cases) was achieved with a wide range of α-dehydroamino acid esters and α-enamides. This practicable catalytic system was further applied in the scalable synthesis of highly optically
通过一个新的高刚性手性二茂铁基膦-螺亚膦酰胺配体家族,实现了功能化烯烃的高效 Rh 催化氢化。使用范围广泛的 α-脱氢氨基酸酯和 α-烯酰胺可以实现出色的对映控制(大多数情况下 >99% ee )。该实用催化体系进一步应用于西那卡塞和d-苯丙氨酸的高光学纯关键中间体的可扩展合成。
Alkylative Amination of Biogenic Furans through Imine-to-Azaallyl Anion Umpolung
作者:Jan Deska、Fabian Blume、Mhd Albeiruty
DOI:10.1055/s-0034-1380201
日期:——
Starting from biogenic furfurals, an operationally simple and scalable condensation-umpolung-alkylation protocol was employed in the synthesis of racemic furfurylamines. Subsequent enzymatic kinetic resolution by -transaminase or lipase biocatalysts allows for the preparation of functionalized heterocyclic building blocks from biogenic base chemicals in optically pure form.