One-shot photochemical synthesis of 5-(thiophen-3-yl)pyrano[2,3-c]chromen-2(3H)-ones from 3-propynyloxy-chromenones: a case of an intramolecular Paterno–Buchi reaction
作者:Pooja Jindal、Rimpy Bhatia、Sadhika Khullar、Sanjay K. Mandal、Ramesh C. Kamboj
DOI:10.1039/c3pp50396h
日期:2014.3
5-(Thiophen-3-yl)pyrano[2,3-c]chromen-2(3H)-ones (2), angular tricyclic compounds, were synthesized in significantly high yields through the photoinduced intramolecular coupling of the acetylenic group with the carbonyl centre in 3-(prop-2-ynyloxy)-2-(thiophen-3-yl)-4H-chromen-4-ones (1). This photoreaction is a case of an intramolecular Paterno–Buchi reaction and is unprecedented in 3-propynyloxy-chromenones
通过炔属基团的光诱导分子内偶联,高产率地合成了角三环化合物5-(噻吩-3-基)吡喃并[2,3 - c ] chromen-2(3 H)-ones(2)。在3-(丙-2-炔基氧基)羰基-2-中心(噻吩-3-基)-4- ħ -苯并吡喃-4-酮(1)。这种光反应是分子内Paterno-Buchi反应的一种情况,在3-丙炔氧基-色农酮中是空前的。2的结构已通过光谱(FTIR,NMR和质量)和单晶X射线晶体学研究确定。