Studies on a catalytic version of the Matteson asymmetric homologation reaction
作者:Keith Smith、Basil A. Saleh、Mohammed B. Alshammari、Gamal A. El-Hiti、Mark C. Elliott
DOI:10.1039/d1ob00604e
日期:——
Studies of a catalyticasymmetric version of the Matteson reaction between dichloromethylboronates and organolithium reagents have been undertaken. From several different chiral catalytic systems studied, only one based on a mannitol derivative has given substantial asymmetric induction close to that previously achieved with a bis(oxazoline) derivative and ytterbium triflate. More detailed study of
Iridium-Catalyzed Chemoselective and Enantioselective Hydrogenation of (1-Chloro-1-Alkenyl) Boronic Esters
作者:Ivana Gazić Smilović、Eva Casas-Arcé、Stephen J. Roseblade、Ulrike Nettekoven、Antonio Zanotti-Gerosa、Miroslav Kovačevič、Zdenko Časar
DOI:10.1002/anie.201106262
日期:2012.1.23
Persistent chlorine: Hydrogenation of borolane‐substituted vinylic chlorides catalyzed by IrP N complexes greatly preserved the chlorine substituent on the hydrogenated product, with only 3–19 % of dechlorinated byproducts present after hydrogenation. The α‐chloro boronicester products are ideal precursors for proteasome‐inhibitor‐type anti‐cancer drugs, a fact which demonstrates the utility of this
持久性氯:由铱催化的环戊硼烷-取代的乙烯基氯化物的加氢 P N络合物大大保留在氢化产物的氯取代基,只有3-19%氢化后存在的脱氯副产物。α-氯硼酸酯产品是蛋白酶体抑制剂型抗癌药物的理想前体,这一事实证明了这种氢化方法的实用性。
A Practical Synthetic Approach to Chiral (α-Chloroalkyl)boronic Esters via Iridium-Catalyzed Chemoselective Hydrogenation of Chloro-Substituted Alkenyl Boronates
on the occasion of her birthday Abstract Chiral (α-chloroalkyl)boronicesters are obtained by homogeneous asymmetric iridium-catalyzedchemoselectivehydrogenation of (1-chloro-1-alkenyl)boronicesters. P,N–Iridium catalysis provides low level of dehalogenation during the hydrogenation, while the catalyst activity and enantioselectivity essentially depends on the applied P,N ligand features. Fine tuning
在生日那天献给Dominique Lorcy博士(法国雷恩1大学) 抽象 通过(1-氯-1-烯基)硼酸酯的均相不对称铱催化的化学选择性氢化获得手性(α-氯烷基)硼酸酯。在氢化过程中,P,N–铱催化提供的脱卤水平较低,而催化剂的活性和对映选择性则主要取决于所应用的P,N配体的特征。P,N配体结构的微调可实现高转化率,广泛的底物接受度以及对映体过量值高达94%以及对氯含量低的高至出色的对映选择性。对于制备工业上重要的异丁基衍生物,还可以达到S / C = 200的低催化剂负载量。 通过(1-氯-1-烯基)硼酸酯的均相不对称铱催化的化学选择性氢化获得手性(α-氯烷基)硼酸酯。在氢化过程中,P,N–铱催化提供的脱卤水平较低,而催化剂的活性和对映选择性则主要取决于所应用的P,N配体的特征。P,N配体结构的微调可实现高转化率,广泛的底物接受度以及对映体过量值高达94%以及对氯含量低的高至出色的对映选择
[EN] NEW SYNTHETIC ROUTE FOR THE PREPARATION OF ALPHA-AMINO BORONIC ESTERS<br/>[FR] NOUVELLE TECHNIQUE DE SYNTHÈSE POUR LA PRÉPARATION DE DÉRIVÉS D'ACIDE a-AMINOBORONIQUE PAR L'INTERMÉDIAIRE D'ALK-1-YNES SUBSTITUÉES
申请人:LEK PHARMACEUTICALS
公开号:WO2010146172A3
公开(公告)日:2012-02-23
Enantiotopic Differentiation of <i>pro</i>-<i>R</i> or <i>pro</i>-<i>S</i> Chlorides in (Dichloromethyl)borates by Chiral Lewis Acids: Enantioselective Synthesis of (α-Chloroalkyl)boronates