[EN] NEW SYNTHETIC ROUTE FOR THE PREPARATION OF ALPHA-AMINO BORONIC ESTERS [FR] NOUVELLE TECHNIQUE DE SYNTHÈSE POUR LA PRÉPARATION DE DÉRIVÉS D'ACIDE a-AMINOBORONIQUE PAR L'INTERMÉDIAIRE D'ALK-1-YNES SUBSTITUÉES
[EN] NEW SYNTHETIC ROUTE FOR THE PREPARATION OF ALPHA-AMINO BORONIC ESTERS [FR] NOUVELLE TECHNIQUE DE SYNTHÈSE POUR LA PRÉPARATION DE DÉRIVÉS D'ACIDE a-AMINOBORONIQUE PAR L'INTERMÉDIAIRE D'ALK-1-YNES SUBSTITUÉES
作者:Hayden A. Sharma、Jake Z. Essman、Eric N. Jacobsen
DOI:10.1126/science.abm0386
日期:2021.11.5
the construction of a wide variety of trisubstituted stereocenters through a catalytically accessed common chiral intermediate could prove highly enabling for the field of synthetic chemistry. We report the discovery of enantioselective, catalytic 1,2-boronate rearrangements for the synthesis of α-chloro pinacol boronic esters from readily available boronic esters and dichloromethane. The chiral building
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
Deoxygenative Haloboration and Enantioselective Chloroboration of Carbonyls
作者:Dong Wang、Jun Zhou、Zihao Hu、Tao XU
DOI:10.1021/jacs.2c11024
日期:2022.12.21
α-haloboronates. Meanwhile, the difficult-to-obtain tertiary α-haloboronates can be also readily prepared via the same strategy with ketones. Furthermore, enantioselective chloroboration of carbonyls was successfully achieved to give chiral secondary or tertiary α-chloroboronates, the important intermediates to access enantioenrich multisubstituted stereocenters. These versatile products can be surprisingly attained
[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