Access to α,γ-Diamino Diacid Derivatives via Organocatalytic Asymmetric 1,4-Addition of Azlactones and Dehydroalanines
作者:Junxian Yang、Wangsheng Sun、Zeyuan He、Changjun Yu、Guangjun Bao、Yiping Li、Yuyang Liu、Liang Hong、Rui Wang
DOI:10.1021/acs.orglett.8b03020
日期:2018.11.16
functional-group-tolerant organocatalyticasymmetric 1,4-addition of azlactones and dehydroalanine is disclosed. The reaction is used for the first synthesis of chiral α,γ-diamino diacid derivatives with nonadjacent stereogenic centers in moderate to high yields, with excellent diastereo- and enantioselectivities, under the catalysis of a chiral thiourea catalyst. In addition, the reaction could be conducted
Construction of allylic amino acid derivatives through a catalytic asymmetric allylic alkylation of azlactones with vinyl cyclopropanes
作者:Zhenquan Liu、Xing Feng、Jingyao Xu、Xiangxing Jiang、Xiaoqing Cai
DOI:10.1016/j.tetlet.2020.151694
日期:2020.3
A simple and concise asymmetric allylic alkylation of azlactones was developed for direct construction of quaternary amino acid derivatives. Electrophilic synthons vinyl propanes were used in the presence of Pd catalyst under mild conditions, which afforded the desired quaternary allylic amino acid derivatives in good to excellent yields with a high level of stereoselectivity
2H-chromenes has been established that uses 1,1′-binaphthyl-2,2′-diyl hydrogen phosphate (BiNPO4H) as the catalyst and gives excellent diastereoselectivities (≥19:1 dr) in most cases. This protocol has a high compatibility with various substituents of substrates, offering a catalytic and useful entry to the fabrication of the syntheticallyimportant C2-functionalized 2H-chromene scaffold.
已经建立了一种新的 Brønsted 酸催化炔丙醇与吖内酯的氧合环化以合成 C 2 -吖内酯化的2 H -色烯,其使用 1,1'-联萘-2,2'-磷酸氢二酯 (BiNPO 4 H) 作为在大多数情况下,催化剂具有出色的非对映选择性(≥19:1 dr)。该协议与底物的各种取代基具有高度相容性,为合成重要的 C 2 -功能化2 H -色烯支架的制造提供了催化和有用的入口。
Organocatalytic enantioselective formal arylation of azlactones using quinones as the aromatic partner
作者:Guofeng Li、Wangsheng Sun、Jingyi Li、Fengjing Jia、Liang Hong、Rui Wang
DOI:10.1039/c5cc03677a
日期:——
Catalytic enantioselective formal arylation of azlactones using quinones as the aromatic partner was developed.
作者:Ming Zhang、Changjun Yu、Junqiu Xie、Xudong Xun、Wangsheng Sun、Liang Hong、Rui Wang
DOI:10.1002/anie.201712571
日期:2018.4.23
synthesis of imidazolidin‐5‐ones through a phosphoric acid catalyzed reaction between azlactones and N‐substituted β‐carbolines is reported. The reaction takes place via an initial formal [2+2] cycloaddition to generate an α‐amino‐β‐lactam, which subsequently undergoes an acid‐catalyzed asymmetric penicillin–penillonicacid (PPA) rearrangement with high diastereo‐ and enantioselectivity. To the best