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。
Copper (II)/RuPHOX-Catalyzed Enantioselective Mannich-Type Reaction of Glycine Schiff Bases with Cyclic Ketimines
作者:Qihang Shao、Liang Wu、Jianzhong Chen、Ilya D. Gridnev、Guoqiang Yang、Fang Xie、Wanbin Zhang
DOI:10.1002/adsc.201800850
日期:2018.12.3
enantioselective Mannich‐type reaction of glycine Schiff bases with cyclic ketimines was developed, affording chiral α,ß‐diaminoacidderivatives in good yields with moderate to good ee and dr values. This provides an efficient methodology for furnishing chiral Cβ‐tetrasubstituted α,β‐diaminoacid precursors. The catalytic system is compatible with a series of substrates. In addition, an interesting nonlinear
Highly Enantioselective Synthesis of Fused Tri‐ and Tetrasubstituted Aziridines: aza‐Darzens Reaction of Cyclic Imines with α‐Halogenated Ketones Catalyzed by Bifunctional Phosphonium Salt
作者:Jianke Pan、Jia‐Hong Wu、Hongkui Zhang、Xiaoyu Ren、Jian‐Ping Tan、Lixiang Zhu、Hong‐Su Zhang、Chunhui Jiang、Tianli Wang
DOI:10.1002/anie.201900613
日期:2019.5.27
The first enantioselective aza‐Darzens reaction of cyclic imines with α‐halogenated ketones was realized under mild reaction conditions by using amino‐acid‐derived bifunctional phosphonium salts as phase‐transfer promoters. A variety of structurally dense tri‐ and tetrasubstituted aziridine derivatives, containing benzofused heterocycles as well as spiro‐structures, were readily synthesized in high yields
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