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
Dipeptide-Based Phosphonium Salt Catalysis: Application to Enantioselective Synthesis of Fused Tri- and Tetrasubstituted Aziridines
作者:Jia-Hong Wu、Jianke Pan、Tianli Wang
DOI:10.1055/s-0039-1690192
日期:2019.12
salt catalysis. This article briefly discusses the recent development in asymmetricreactions (mainly including nucleophilic additions and cyclizations) promoted by chiral quaternary phosphonium salt catalysts. We expect that more catalyticasymmetricreactions will be developed on the basis of such new phase-transfer catalytic systems in the near future.