(Dynamic) Kinetic Resolution of Enamines/Imines: Enantioselective N‐Heterocyclic Carbene Catalyzed [3+3] Annulation of Bromoenals and Enamines/Imines
作者:Kun‐Quan Chen、Zhong‐Hua Gao、Song Ye
DOI:10.1002/anie.201813047
日期:2019.1.21
The enantioselectiveN‐heterocycliccarbenecatalyzed [3+3] annulation of α‐bromoenals by dynamic kinetic resolution (DKR) of enamines and normal resolution of α,α‐disubstituted imines were developed. The corresponding substituted dihydropyridones were isolated in good yields with excellent diastereo‐ and enantioselectivities, and a high selective factor (up to 83) was realized for the resolution of
Development of Axially Chiral Styrene-Type Carboxylic Acid Ligands via Palladium-Catalyzed Asymmetric C–H Alkynylation
作者:Chi Yang、Fei Li、Tian-Rui Wu、Ru Cui、Bing-Bing Wu、Ruo-Xing Jin、Yan Li、Xi-Sheng Wang
DOI:10.1021/acs.orglett.1c02692
日期:2021.11.5
coordinated carboxylate-directed palladium-catalyzed atroposelective C–Halkynylation method for the development of novel axially chiral styrene-type carboxylic acids is disclosed. This transformation exhibits good yields (up to 85%), excellent enantiocontrol (up to 99% ee), and mild conditions. Notably, the synthetic utility of the resulting alkynyl carboxylic acid derivatives was demonstrated by various
A general metal-free route to 1,4-disubstituted and 1,4,5-trisubstituted 1,2,3-triazoles was developed. α-Haloacroleins reacted with organic azides in a DMSO/H2O mixture solvent at room temperature to produce 1,4-disubstituted triazoles (up to 99%) with exclusive regioselectivities. This protocol is convenient and scalable with a broad substrate scope including aliphatic and aromatic azides. The resulting
开发了一种通向1,4-二取代和1,4,5-三取代的1,2,3-三唑的无金属路线。在室温下,α-卤代丙烯醛与有机叠氮化物在DMSO / H 2 O混合溶剂中反应,生成具有区域选择性的1,4-二取代三唑(最高99%)。该协议方便且可扩展,具有广泛的底物范围,包括脂肪族和芳香族叠氮化物。所得三唑在C4位上显示醛基,并证明了其合成用途。还鉴定了一种含有非对映体质子的1,2,3-三唑化合物。
Synthesis of functionalized γ-lactones via a three-component cascade reaction catalyzed by consecutive N-heterocyclic carbene systems
Two consecutive N-heterocyclic carbene (NHC) catalytic systems were combined in a one-pot cascade reaction for the assembly of aromatic aldehydes and 2-haloenals into a structurally complex γ-lactone backbone.
N-Heterocyclic Carbene-Catalyzed Enantioselective β-Amination of α-Bromoenals Enabled by a Proton-Shuttling Strategy
作者:Ming Lang、Jian Wang
DOI:10.1002/ejoc.201800648
日期:2018.6.22
An enantioselective NHC‐catalyzed β‐amination of α‐bromoenals has been established. This [4+3] annulation protocol allows the rapid assembly of 1,5‐benzodiazepine pharmacophores from simple and readily available starting materials under mild conditions.