Synthesis of anti-2,3-dihydro-1,2,3-trisubstituted-1H-naphth [1,2-e][1,3]oxazine derivatives via multicomponent approach
作者:Ruli Borah、Arup Kumar Dutta、Parishmita Sarma、Champak Dutta、Bipul Sarma
DOI:10.1039/c3ra47211f
日期:——
A series of anti-2,3-dihydro-1,2,3-trisubstituted-1H-naphth [1,2-e][1,3]oxazine derivatives 6 were exclusively obtained in high yields for the first time through multicomponent reactions (MCRs) of 2-naphthol, aromatic aldehydes and electron rich primary amines in ethanol at room temperature using CCl3COOH as catalyst. The same reaction could be conducted effectively in solvent-free medium at 100 °C. The stereochemistry of the two hydrogens connected to C-2 and C-4 (1,3) positions of the oxazine ring are identified as anti-orientation by single crystal XRD, COSY and NOESY analysis.
首次通过多组分反应(MCRs),在室温下使用三氯乙酸(CCl3COOH)作为催化剂,以2-萘酚、芳香醛和富电子的伯胺在乙醇中反应,高产率地合成了系列反式-2,3-二氢-1,2,3-三取代-1H-萘[1,2-e][1,3]噁嗪衍生物6。相同反应在无溶剂条件下于100°C也能有效进行。通过单晶XRD、COSY和NOESY分析,确定了噁嗪环的C-2和C-4(1,3)位置连接的两个氢的立体化学为反式构型。