Chiral squaramide-catalysed one-pot enantioselective sulfa-Michael addition/thioesterification of thiols with α,β-unsaturated N-acylated succinimides
作者:Bo-Liang Zhao、Da-Ming Du
DOI:10.1039/c3ob42137f
日期:——
A novel highly enantioselective one-pot dithiolation through sulfa-Michael addition/thioesterification of thiols with α,β-unsaturatedN-acylated succinimides catalysed by squaramide has been developed. This organocatalysed reaction proceeded well in high to excellent yields (up to >99%) to afford useful bioactive β-sulfated thioester derivatives with high enantioselectivities (up to 96% ee).
Chiral squaramide-catalysed enantioselective Michael/cyclization cascade reaction of 3-hydroxyoxindoles with α,β-unsaturated N-acylated succinimides
作者:Sheng Ming、Bo-Liang Zhao、Da-Ming Du
DOI:10.1039/c7ob01307h
日期:——
Michael/cyclizationcascadereaction of 3-hydroxyoxindoles with α,β-unsaturated N-acylated succinimides is disclosed. With quinine-derived squaramide as the catalyst, a broad range of the desired spirooxindole lactone derivatives bearing two contiguous stereocenters were obtained in good yields (up to 89%) with high diastereoselectivities (up to >95:5 dr) and excellent enantioselectivities (up to 99%
Electrochemical oxidative transamidation of tertiary amines with <i>N</i>-acyl imides to access amide compounds
作者:Hai Lin、Shengzhang Liu、Qing Li、Qi Zhang、Lingyun Yang、Tao Wang、Jin Luo
DOI:10.1080/00397911.2023.2228947
日期:2023.9.2
Abstract A novel and efficient electrochemical oxidative transamidation of tertiaryamines with N-acyl imides is described. This protocol is environmentally friendly and ease to handle as tertiaryamines are used as surrogates for secondary amines. The C-N bond of tertiaryamines is cleaved, preparing amide compounds in a facile approach with 29 examples in 11–80% yields.
Nickel‐Catalyzed Isotopic Labeling: Synthesis of Oxygen‐18‐Labeled Esters from Amides
作者:Nithin Pootheri、Sunwoo Lee
DOI:10.1002/adsc.202300729
日期:2023.11.21
three-component reaction of amides, alkyl halides, and 18O-labeled water. This method demonstrated excellent selectivity and compatibility with various amides and alkyl halides, allowing the synthesis of diverse isotopicallylabelled esters. Ni-catalyzed reaction of alkyl bromides, carboxylates that generated from amides, and water in the presence of a base formed the desired esters.
开发了一种通过酰胺、烷基卤和 18 O-标记水的 Ni 催化三组分反应制备18 O-标记酯的方法。该方法表现出优异的选择性以及与各种酰胺和烷基卤的相容性,从而可以合成多种同位素标记的酯。在碱存在下,烷基溴、由酰胺生成的羧酸盐和水发生镍催化反应,形成所需的酯。