<scp>Cobalt‐Catalyzed</scp>
Enantioselec tive
<scp>Ring‐Opening</scp>
Reactions of Oxa‐ and Aza‐bicyclic Alkenes with Alkenylboronic Acids
作者:Di Zhu、Yongmei Zhao、Qinglei Chong、Fanke Meng
DOI:10.1002/cjoc.202100622
日期:2022.1.15
Catalytic enantioselective ring-opening of oxa- and aza-bicyclic alkenes with readily available accessible alkenylboronic acids, promoted by a chiral phosphine–Co complex, is reported. Such a process represents the unprecedented Co-catalyzed introduction of various alkenyl groups onto the oxa- and aza-bicyclic alkenes, affording a widerange of multisubstituted functionalized cyclohexenes in up to
据报道,在手性膦-钴配合物的促进下,氧杂和氮杂双环烯烃与容易获得的烯基硼酸催化对映选择性开环。这样的过程代表了前所未有的将各种烯基引入氧杂-和氮杂-双环烯烃上,以高达 98% 的收率和 99.5:0.5 er 提供范围广泛的多取代官能化环己烯。
Merging Manganese and Iminium Catalysis: Selective Hydroalkenylation of Unsaturated Aldehydes and Ketones
hydroalkenylation of unsaturated aldehydes and ketones has been accomplished via synergistic HOMO and LUMO activation by means of manganese and iminium catalysis. The use of chiral organocatalysts could provide the corresponding products with moderate enantioselectivity.
不饱和醛和酮的选择性加氢烯基化是通过锰和亚胺催化的协同 HOMO 和 LUMO 活化来完成的。使用手性有机催化剂可以提供具有中等对映选择性的相应产物。
Cobalt‐Catalyzed Diastereo‐ and Enantioselective Hydroalkenylation of Cyclopropenes with Alkenylboronic Acids
Catalytic diastereo‐ and enantioselective hydroalkenylation of 3,3‐disubstituted cyclopropenes with readily accessible alkenylboronic acids, promoted by a chiral phosphine/Co complex, is presented. Such a process constitutes the unprecedented and direct introduction of a wide range of alkenyl groups onto the cyclopropane motif to afford multisubstituted cyclopropanes in up to 95 % yield with greater