Double axially chiral bisphosphorylimides as novel Brønsted acids in asymmetric three-component Mannich reaction
摘要:
A double axially chiral bisphosphorylimide has been demonstrated to be an efficient and highly sterically hindered Bronsted acid in asymmetric three-component Mannich reactions. Optically active syn-beta-amino ketones were obtained in high yields (up to 99%) with excellent diastereoselectivity (99:1) and enantioselectivity (up to 99% ee). A gram-scale reaction was also performed to prove the synthetic application value of this reaction. (c) 2012 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Asymmetric Arylation of C(sp3)–H Bonds of Aliphatic Amides: Controlling Enantioselectivity Using Chiral Phosphoric Amides/Acids
摘要:
Enantioselective arylation of secondary beta-C(sp(3))-H bonds of 8-aminoquinoline amides was realized with a palladium catalyst. Chiral phosphoric amides and acids were used for the first time to control the stereoselectivity at the C-H bond cleavage step in the C-H activation reactions.
Chiral N-phosphoryl imines: design, synthesis and direct asymmetric addition reactions with diketones and diesters
作者:Hao Sun、Trideep Rajale、Yi Pan、Guigen Li
DOI:10.1016/j.tetlet.2010.06.072
日期:2010.8
Chiral N-phosphoryl imines derived from (S)-BINOL have been designed and synthesized in good to excellent chemical yields. These N-phosphoryl imines were found to react with diketones smoothly without the use of any bases. They can also serve as electrophiles for the reaction with diethyl malonate in the presence of potassium carbonate. Good yields (62%—quant) and excellent diastereoselectivities (up
[EN] STRECKER REAGENTS, THEIR DERIVATIVES, METHODS FOR FORMING THE SAME AND IMPROVED STRECKER REACTION<br/>[FR] RÉACTIFS DE STRECKER, LEURS DÉRIVÉS, PROCÉDÉS POUR LES FORMER ET RÉACTION DE STRECKER AMÉLIORÉE
申请人:NOWA PHARMACEUTICALS CO LTD
公开号:WO2011116530A1
公开(公告)日:2011-09-29
Strecker reagents, their derivatives and methods for forming the same and improved Strecker reaction are provided. The electrophiles for asymmetric Strecker reaction include achiral N-phosphorazides, N-phosphoramides, N-phosphonyl imines and their derivatives. The nucleophiles for asymmetric Strecker reaction include chiral BINOL-derived azides, amides, imines and their derivatives, the chiral and achiral diol-based cyanides and their derivatives, the chiral and achiral diamine-based cyanides and their derivatives, the chiral and achiral amino alcohol-based cyanides and their derivatives, the Strecker nucleophiles that are derived from chiral and achiral hydroxyl carboxylic acids and amino acids. Methods of forming the electrophile for asymmetric Strecker reaction comprise the reactions with steps of: a) synthesizing phosphoryl chloride from achiral diamine; b) synthesizing phosphorous azide; c) synthesizing phosphoramide; d) synthesizing the corresponding achiral N-phosphonyl imines. The asymmetric catalytic Strecker reaction of new achiral N-phosphonyl imines has been developed to give excellent enantioselectivity (up to >99%ee) and yields (up to >97%).
STRECKER REAGENTS, THEIR DERIVATIVES, METHODS FOR FORMING THE SAME AND IMPROVED STRECKER REACTION
申请人:Li Guigen
公开号:US20130137889A1
公开(公告)日:2013-05-30
Strecker reagents, their derivatives and methods for forming the same and improved Strecker reaction are provided. The electrophiles for asymmetric Strecker reaction include achiral N-phosphorazides, N-phosphoramides, N-phosphonyl imines and their derivatives. The nucleophiles for asymmetric Strecker reaction include chiral BINOL-derived azides, amides, imines and their derivatives, the chiral and achiral diol-based cyanides and their derivatives, the chiral and achiral diamine-based cyanides and their derivatives, the chiral and achiral amino alcohol-based cyanides and their derivatives, the Strecker nucleophiles that are derived from chiral and achiral hydroxyl carboxylic acids and amino acids. Methods of forming the electrophile for asymmetric Strecker reaction comprise the reactions with steps of: a) synthesizing phosphoryl chloride from achiral diamine; b) synthesizing phosphorous azide; c) synthesizing phosphoramide; d) synthesizing the corresponding achiral N-phosphonyl imines. The asymmetric catalytic Strecker reaction of new achiral N-phosphonyl imines has been developed to give excellent enantioselectivity (up to >99% ee) and yields (up to >97%).
A double axially chiral bisphosphorylimide has been demonstrated to be an efficient and highly sterically hindered Bronsted acid in asymmetric three-component Mannich reactions. Optically active syn-beta-amino ketones were obtained in high yields (up to 99%) with excellent diastereoselectivity (99:1) and enantioselectivity (up to 99% ee). A gram-scale reaction was also performed to prove the synthetic application value of this reaction. (c) 2012 Elsevier Ltd. All rights reserved.
Double Axially Chiral Bisphosphorylimides Catalyzed Highly Enantioselective and Efficient Friedel-Crafts Reaction of Indoles with Imines
Cool cats: 1,1′‐Bi‐2‐naphthol and vaulted 3,3′‐biphenanthrol‐type bisphosphorylimides enabled the atom‐economical and highlyenantioselective Friedel–Crafts reaction between indoles and N‐tosylimines with a low catalyst loading (see scheme). A very small amount of 4‐(dimethylamino)pyridine (DMAP) suppressed the bisindole side product efficiently. The ortho‐substituted aldimine substrates performed