作者:Alistair J. M. Farley、Christopher Sandford、Darren J. Dixon
DOI:10.1021/jacs.5b10226
日期:2015.12.30
The highly enantioselective sulfa-Michael addition of alkyl thiols to unactivated α-substituted acrylate esters catalyzed by a bifunctional iminophosphorane organocatalyst under mild conditions is described. The strong Brønsted basicity of the iminophosphorane moiety of the catalyst provides the necessary activation of the alkyl thiol pro-nucleophile, while the two tert-leucine residues flanking a
Bifunctional Iminophosphorane-Catalyzed Enantioselective Sulfa-Michael Addition to Unactivated α,β-Unsaturated Amides
作者:Daniel Rozsar、Michele Formica、Ken Yamazaki、Trevor A. Hamlin、Darren J. Dixon
DOI:10.1021/jacs.1c11898
日期:2022.1.19
unactivated α,β-unsaturatedamides is described. Consistently high enantiomeric excesses and yields were obtained over a wide range of alkyl thiol pronucleophiles and electrophiles under mild reaction conditions, enabled by a novel squaramide-based bifunctional iminophosphorane catalyst. Low catalyst loadings (2.0 mol %) were achieved on a decagram scale, demonstrating the scalability of the reaction. Computational
7-azaindol-3-ylacrylamides active as kinase inhibitors
申请人:NERVIANO MEDICAL SCIENCES S.r.l.
公开号:EP2070928A1
公开(公告)日:2009-06-17
Compounds represented by Formula (I)
wherein R1 and R2 are as defined in the specification, compositions thereof, and methods of use thereof.
由式(I)表示的化合物,其中R1和R2如规范中定义,以及它们的组合物和使用方法。
Isoselective ring-opening polymerization and asymmetric kinetic resolution polymerization of <i>rac</i>-lactide catalyzed by bifunctional iminophosphorane–thiourea/urea catalysts
作者:Chengdong Lv、Li Zhou、Ruiting Yuan、Qaiser Mahmood、Guangqiang Xu、Qinggang Wang
DOI:10.1039/c9nj05074d
日期:——
highest stereoselectivity (Pm) was up to 0.80 using rac-IPU-1 undermild reaction conditions. The mechanistic study indicated that stereoselective ROPs of rac-LA were mainly controlled by a chain-end control mechanism when using rac/(R,R)-IPTU-1/IPU-1 as catalysts. Additionally, the ee values of −11% at 0 °C and −17% at −40 °C were achieved at about 50% conversion using (S)-IPU-2 as a chiral catalyst. The
合成了一系列亚氨基正膦-硫脲/脲双功能催化剂,并将其用于外消旋丙交酯的等选择性开环聚合。ROP被有效地促进,提供具有受控分子量,窄分子量分布和明确定义的端基的聚丙交酯,而没有不希望的副反应。实验数据表明,rac -LA的ROP是一个“受控/生活”过程。使用rac -IPU-1在温和的反应条件下,最高立体选择性(P m)高达0.80 。机理研究表明,使用rac /()时,rac -LA的立体选择性ROP主要受链端控制机制控制。R,R)-IPTU-1 / IPU-1作为催化剂。另外,使用(S)-IPU-2作为手性催化剂,在约50%的转化率下,ee值在0°C时为-11%,在-40°C时为-17%。选择性因子(s = k L / k D)为1.6,表明发生了明确的动力学拆分,并且涉及对映体位点控制机制。
Second Generation Catalytic Enantioselective Nucleophilic Desymmetrization at Phosphorus (V): Improved Generality, Efficiency and Modularity
作者:Michele Formica、Branislav Ferko、Thomas Marsh、Timothy A. Davidson、Ken Yamazaki、Darren J. Dixon
DOI:10.1002/anie.202400673
日期:2024.4.24
two-phase strategy for the enantioselectivesynthesis of stereogenic at phosphorus (V) compounds. This protocol, consisting of a bifunctional iminophosphorane (BIMP) catalyzed nucleophilic desymmetrization of prochiral, bench stable P(V) precursors and subsequent enantiospecific substitution allows for divergent access to a range of C-, N-, O- and S- substituted P(V) compounds from a handful of enantioenriched
用于对映选择性合成立体源磷 (V) 化合物的第二代催化两相策略。该方案由双功能亚氨基正膦 (BIMP) 催化的前手性、工作台稳定的 P(V) 前体的亲核去对称化和随后的对映特异性取代组成,允许不同地获得一系列C -、 N -、 O - 和S - 取代的 P( V) 来自少数对映体富集中间体的化合物。