CoII/Box‐catalyzed [Box=bis(oxazoline)] enantioselective addition of potassium allyltrifluoroborate to cyclic ketimines was developed, providing the corresponding chiral α‐tertiary amines in high yields and with good enantioselectivity values. Alkoxycarbonyl‐ and alkyl‐substituted saccharin‐derived ketimines are suitable substrates for this allylation reaction. The product can be converted to complex molecules
开发了Co II / Box催化的[Box =双(恶唑啉)]烯丙基三氟硼酸钾对环酮亚胺的对映选择性加成,提供了高收率和良好对映选择性值的相应手性α-叔胺。烷氧羰基和烷基取代的糖精衍生的酮亚胺是该烯丙基化反应的合适底物。该产品可以通过几个简单的步骤转化为复杂的分子,包括MK-0371的前体,它是一种驱动蛋白纺锤体蛋白抑制剂。另外,该催化体系显示出强烈的正非线性效应。
Simple Branched Sulfur–Olefins as Chiral Ligands for Rh-Catalyzed Asymmetric Arylation of Cyclic Ketimines: Highly Enantioselective Construction of Tetrasubstituted Carbon Stereocenters
作者:Hui Wang、Tao Jiang、Ming-Hua Xu
DOI:10.1021/ja3110818
日期:2013.1.23
New, simple, sulfinamide-based branched olefin ligands have been developed and successfully used in Rh-catalyzed asymmetric arylations of cyclic ketimines, providing efficient and highly enantioselective access to valuable benzosultams and benzosulfamidates containing a stereogenic quaternary carbon center. This is the first example of applying a sulfur-olefin ligand in catalytic asymmetric addition
Rhodium-catalyzed addition reactions of benzylic C–H bonds to cyclic N-sulfonyl ketimines via π-coordination
作者:Yuntong Li、Hang Shi
DOI:10.1016/j.cclet.2023.108650
日期:2024.3
Mannich-type reactions are a widely used method for the synthesis of amines due to the readily availability of nucleophiles and electrophiles. However, the inclusion of alkylarenes instead of active carbon pronucleophiles such as aldehydes and ketones in these addition reactions has been a challenge due to the inherent difficulty of benzylic deprotonation. In this study, we present a novel approach
Rhodium-Catalyzed Addition of (Trialkylsilyl)arenes to Electrophiles via π-Coordination-Driven C–Si Bond Activation
作者:Yunzhi Lin、Hang Shi
DOI:10.1021/jacs.3c08603
日期:2023.10.18
species activates the unbiased C(aryl)–Si bond, increasing its polarity by forming an η6-arene complex, thereby facilitating heterolysis. The resulting phenyl anion complex readily engages in addition reactions with external electrophiles, effectively forming C–C bonds. Through comprehensive computational studies, we have unraveled an unexpected stepwise pathway for desilylation with fluoride. This pathway