Kinetic Resolution of 1,
<scp>2‐Diamines</scp>
via Organocatalyzed Asymmetric Electrophilic Aminations of Anilines
作者:Jinglei Xie、Zheng Guo、Wei Liu、Dekun Zhang、Yu‐Peng He、Xiaoyu Yang
DOI:10.1002/cjoc.202200125
日期:2022.7.15
efficient kinetic resolution (KR) protocol for 1,2-diamines has been developed through asymmetric electrophilic aminations of anilines enabled by chiral phosphoric acid catalysis. A wide array of substituted 1,2-diamines were compatible with this method, generating both the recovered staring materials and the amination products with high enantioselectivities (with s-factor up to 218). Notably, this method
CsPbBr<sub>3</sub> perovskite quantum dots as a visible light photocatalyst for cyclisation of diamines and amino alcohols: an efficient approach to synthesize imidazolidines, fused-imidazolidines and oxazolidines
photocatalysts using dibromoisocyanuric acid (DBI) as a benign non-toxic bromide precursor. The QDs were applied as a visible light photocatalyst for intramolecular cyclisation of diamines and aminoalcohols to obtain a range of enantiopure bioactive heterocycles such as imidazolidines, fused-imidazolidines and 1,3-oxazolidines in high yields (isolated yield up to 82%, ee >99%). The reaction is simple
Synthesis of Chiral Vicinal Diamines by Silver(I)-Catalyzed Enantioselective Aminolysis of N-Tosylaziridines
作者:Zhuo Chai、Pei-Jun Yang、Hu Zhang、Shaowu Wang、Gaosheng Yang
DOI:10.1002/anie.201610693
日期:2017.1.9
The kinetic resolution of 2‐aryl‐N‐tosylaziridines and the asymmetric desymmetrization of meso‐N‐tosylaziridines by ring openings with various primary and secondary anilines, and aliphatic amines as nucleophile have been realized by using a single silver(I)/chiral diphosphine complex as catalyst for the first time. The simple starting materials, broad scope, and easy scalability render this protocol
The role of coordinatively unsaturated sites (CUS) in metal–organic framework (MOF)-catalyzed organic transformation is vital; however, the design and generation of such sites are challenging. We, therefore, report the synthesis of a novel two-dimensional (2D) MOF, [Cu(BTC)(Mim)]n (Cu-SKU-3), with pre-existing unsaturated Lewis acid sites. The presence of these active CUS facilitates a ready-to-use