Jindal Pooja, Bhatia Rimpy, Khullar Sadhika, Mandal Sanjay K, Kamboj Ramesh C
Department of Chemistry, Kurukshetra University, Kurukshetra-136119, Haryana, India.
Photochem Photobiol Sci. 2014 Mar;13(3):488-91. doi: 10.1039/c3pp50396h. Epub 2014 Jan 29.
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. The structure of 2 has been determined by spectroscopic (FTIR, NMR and mass) and single crystal X-ray crystallographic studies.
5-（噻吩-3-基）吡喃并[2,3-c]色烯-2（3H）-酮（2），即角型三环化合物，通过3-（丙-2-炔氧基）-2-（噻吩-3-基）-4H-色烯-4-酮（1）中炔基与羰基中心的光诱导分子内偶联反应，以相当高的产率合成。该光反应是分子内Paterno-Buchi反应的一个实例，在3-丙炔氧基色烯酮中是前所未有的。2的结构已通过光谱（FTIR、NMR和质谱）和单晶X射线晶体学研究确定。
