A simple protocol for the synthesis of chiral bidentate imidodiphosphoric tetramide ligands: application in the metal-free asymmetric allylation of aldehydes
摘要:
The reaction of a series of chiral phosphorus triamides with BuLi and subsequent addition of a phosphoroxychloride diamide afforded the corresponding imidodiphosphoric tetramides in high yield. The use of enantiomerically pure diamides allowed access to bidentate imidodiphosphoric tetramides without loss of optical purity. These bidentate ligands have been used successfully to catalyze the addition of allyltrichlorosilane to aldehydes in an enantioselective fashion up to 60% ee. (C) 2001 Elsevier Science Ltd. All rights reserved.
Koeller, Kevin J.; Rath, Nigam P.; Spilling, Christopher D., Phosphorus, Sulfur and Silicon and the Related Elements, 1995, vol. 103, # 1-4, p. 171 - 182
Cobalt(II)-Catalyzed Stereoselective Olefin Isomerization: Facile Access to Acyclic Trisubstituted Alkenes
作者:Sheng Zhang、Deepika Bedi、Lu Cheng、Daniel K. Unruh、Guigen Li、Michael Findlater
DOI:10.1021/jacs.0c02101
日期:2020.5.13
Stereoselective synthesis of trisubstitutedalkenes is a long-standing challenge in organic chemistry, due to the small energy differences between E and Z isomers of trisubstitutedalkenes (compared with 1,2-disubstituted alkenes). Transition metal-catalyzed isomerization of 1,1-disubstituted alkene can serve as an alternative approach to trisubsti-tuted alkenes, but it remains underdeveloped owing
三取代烯烃的立体选择性合成是有机化学中长期存在的挑战,因为三取代烯烃的 E 和 Z 异构体之间的能量差异很小(与 1,2-二取代烯烃相比)。1,1-二取代烯烃的过渡金属催化异构化可以作为三取代烯烃的替代方法,但由于与反应效率和立体选择性有关的问题,它仍然不发达。在这里,我们展示了一种新型钴催化剂可以克服这些挑战,为获得广泛的三取代烯烃提供有效和立体选择性的途径。该协议与单烯和二烯兼容,并表现出良好的官能团耐受性和可扩展性。而且,它已被证明是构建有机发光体和氘代三取代烯烃的有用工具。对该机制的初步研究表明,该反应涉及钴氢化物途径。该反应的高立体选择性归因于 π-π 堆积效应和底物和催化剂之间的空间位阻。
Chiral phosphoramides, chiral N-phosphonimines and methods for forming the same
申请人:Sun Xiangzhen
公开号:US20100160681A1
公开(公告)日:2010-06-24
This application relates to the design and synthesis of new chiral imines reagents which can be utilized for the synthesis of chiral drugs and their precursors. It describes the design of the free NH2-group-attached chiral phosphoramides, a chiral N-phosphonimines and the methods for forming the same. The free NH2-group-attached chiral phosphoramides, having the structure of formula (I):
wherein R1 and R2 are independently any organic groups. The synthesis of N-phosphoramides was performed starting from chiral 1,2-diamines via the following steps: N,N′-dialkylation consisting of aldehyde condensation and reduction, cyclization with phosphoryl halide, substitution of halide with azide anion and hydrogenation of azides. The N-phosphonyl imines are synthesized by condensation of N-phosphoramides with aldehydes. Quantitative yield was obtained for each of the four steps without special purification. All precursors were obtained as white solids. It should be addressed that after each application reaction of N-phosphonyl imines, N,N′-dialkyl vicinal diamine auxiliaries can be recovered quantitatively with one-time extraction using n-butanol and re-used.
[EN] CHIRAL PHOSPHORAMIDES, CHIRAL N-PHOSPHONIMINES AND METHODS FOR FORMING THE SAME<br/>[FR] PHOSPHORAMIDES CHIRAUX, N-PHOSPHONIMINES CHIRALES ET PROCÉDÉS POUR LEUR PRÉPARATION
申请人:NOWA PHARMACEUTICALS CO LTD
公开号:WO2009000202A1
公开(公告)日:2008-12-31
[EN] The invention relates free NH2-group-attached chiral phosphoramides, a chiral N-phosphonimines and the methods for forming the same. The free NH2-group-attached chiral phosphoramides, having the structure of formula (I) wherein R1 and R2 are independently any organic groups. [FR] L'invention concerne des phosphoramides chiraux sur lesquels est attaché un groupe NH2 libre, des N-phosphonimines chirales, et des procédés pour leur préparation. Les phosphoramides chiraux sur lesquels est attaché un groupe NH2 libre, ont la structure de formule (I) dans laquelle R1 et R2 sont indépendamment n'importe quel groupe organique.
Koeller, Kevin J.; Rath, Nigam P.; Spilling, Christopher D., Phosphorus, Sulfur and Silicon and the Related Elements, 1995, vol. 103, # 1-4, p. 171 - 182
作者:Koeller, Kevin J.、Rath, Nigam P.、Spilling, Christopher D.
DOI:——
日期:——
A simple protocol for the synthesis of chiral bidentate imidodiphosphoric tetramide ligands: application in the metal-free asymmetric allylation of aldehydes
The reaction of a series of chiral phosphorus triamides with BuLi and subsequent addition of a phosphoroxychloride diamide afforded the corresponding imidodiphosphoric tetramides in high yield. The use of enantiomerically pure diamides allowed access to bidentate imidodiphosphoric tetramides without loss of optical purity. These bidentate ligands have been used successfully to catalyze the addition of allyltrichlorosilane to aldehydes in an enantioselective fashion up to 60% ee. (C) 2001 Elsevier Science Ltd. All rights reserved.