NH<sub>4</sub>I-promoted oxidative formation of benzothiazoles and thiazoles from arylacetic acids and phenylalanines with elemental sulfur
作者:Yujia Xia、Huawen Huang、Wei Hu、Guo-Jun Deng
DOI:10.1039/d1ob00671a
日期:——
NH4I/K3PO4-based catalytic system has been established to enable oxidative formation of thiazole compounds from arylacetic acids and phenylalanines with elemental sulfur. While the three-component reaction of anilines or β-naphthylamines with arylacetic acids and elemental sulfur affords benzo[2,1-d]thiazoles and naphtho[2,1-d]thiazoles, the annulation of phenylalanines with elemental sulfur produces 2-benzyl
已经建立了基于NH 4 I/K 3 PO 4的催化体系,以使得能够从芳基乙酸和苯丙氨酸与元素硫氧化形成噻唑化合物。虽然苯胺或 β-萘胺与芳基乙酸和元素硫的三组分反应产生苯并[ 2,1- d ]噻唑和萘并[ 2,1- d ]噻唑,但苯丙氨酸与元素硫的环化产生 2-苄基和 2-苯甲酰基噻唑。这项工作很好地补充了以前来自其他偶联伙伴的苯并噻唑的三组分环化。
Cu-Catalyzed Aerobic Oxidative Sulfuration/Annulation Approach to Thiazoles via Multiple Csp<sup>3</sup>–H Bond Cleavage
practical Cu-catalyzed aerobicoxidativesynthesis of thiazoles was developed. This chemistry for the first time achieved thiazole construction from simple aldehydes, amines, and element sulfur through multiple Csp3–H bond cleavage processes. Molecular oxygen was used as a green oxidant in this oxidative protocol. The substrate scope is broad with the tolerance of aliphatic amines. The mechanistic study
We herein describe the development of a dimerization procedure for amino acids to prepare 2,5‐disubstituted thiazoles and oxazoles in the presence of Na2S⋅9H2O and H2O, respectively. These approaches enabled the direct formation of five‐membered ring systems bearing two different heteroatoms from two amino acid units. Mechanically, decarboxylation, deamination, S/O insertion, cyclization and gradient