Copper-Catalyzed Tandem Multi-Component Approach to 1,3-Oxazines at Room Temperature by Cross-Dehydrogenative Coupling Using Methanol as C1 Feedstock
作者:Paran Borpatra、Mohit Deb、Pranjal Baruah
DOI:10.1055/s-0036-1591775
日期:2018.6
A copper(II)-catalyzed multi-component one-pot approach for the synthesis of 1,3-oxazines at roomtemperature is reported here. Methanol is used as the solvent as well as the carbon source. The methylene carbon of the oxazine product comes from methanol via formaldehyde. tert -Butyl hydroperoxide is used as the oxidant. The reaction uses an environmentally benign metal catalyst and oxidant. No inert
本文报道了一种铜 (II) 催化的多组分一锅法在室温下合成 1,3-恶嗪。甲醇用作溶剂和碳源。恶嗪产品的亚甲基碳来自甲醇经由甲醛。叔丁基过氧化氢用作氧化剂。该反应使用对环境无害的金属催化剂和氧化剂。该反应不需要惰性气氛或预防措施。最重要的是,该反应避免了致癌甲醛的使用。
Redox-Neutral α-Oxygenation of Amines: Reaction Development and Elucidation of the Mechanism
作者:Matthew T. Richers、Martin Breugst、Alena Yu. Platonova、Anja Ullrich、Arne Dieckmann、K. N. Houk、Daniel Seidel
DOI:10.1021/ja501988b
日期:2014.4.23
secondary amines and 2-hydroxybenzaldehydes or related ketones react to furnish benzo[e][1,3]oxazine structures in generally good yields. This overall redox-neutral amine α-C–H functionalization features a combined reductive N-alkylation/oxidative α-functionalization and is catalyzed by acetic acid. In contrast to previous reports, no external oxidants or metal catalysts are required. Reactions performed
reaction of a variety of 1-(aminoalkyl)-2-naphthols or 2-(aminoalkyl)phenols to give the corresponding 1,3-oxazines was developed. The reaction is simple, atom-economic, and proceeds smoothly at roomtemperature under metal-free conditions in ethanol as solvent.