Cobalt‐Catalyzed Cascade Reaction of Ynamides and 1,3‐Dicarbonyl Compounds for Selective Synthesis of Differently Sized
<i>N</i>
‐Heterocycles
作者:Biao Zhang、Xu‐Heng Yang、Jian Huang、Cheng‐an Tao、Jianfang Wang
DOI:10.1002/adsc.202201002
日期:2023.3.7
manifold with various 1,3-dicarbonylcompounds and halogenated N-allyl ynamides was accomplished under alkaline reaction conditions, facilitating the synthesis of differently sized N-heterocycles. A large array of products was prepared to demonstrate the selective synthesis of N-heterocycles of different ring sizes (5-, 6-, and 7-membered rings) via cobalt catalysis. The reaction has broad substrate
Asymmetric Organocatalytic Allylic Substitution of Morita–Baylis–Hillman Carbonates with Allylamines for the Synthesis of 2,5-Dihydropyrroles
作者:Wangsheng Sun、Xiaozhou Ma、Liang Hong、Rui Wang
DOI:10.1021/jo2011522
日期:2011.10.7
The asymmetric allylic substitution reaction of MBH carbonates with allylamines has been developed, which affords N-allyl-beta-amino-alpha-methylene esters in high yields and enantioselectivities. After a subsequent ring-closure metathesis of the products, a series of optically active 2,5-dihydropyrroles could be obtained smoothly in high yields without any loss of enantioselectivity. Finally, a tentative mechanism for rationalization of the reaction has been proposed.