A novel approach for synthesis of fused 1H-pyrano[4,3-b]benzofuran-1-ones was developed based on the photochemical reaction of 2,3-disubstitued 4H-furo[3,2-c]pyran-4-ones. The studied process includes the photocyclization of the hexatriene system and subsequent aromatization of benzene ring via elimination of water molecule. The structure of one of the 1H-pyrano[4,3-b]benzofuran-1-one derivatives was determined by X-ray diffraction.

中文翻译：

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通过取代的4 H-呋喃并[3,2 - c ]吡喃-4-酮的光化学环化反应合成1 H-吡喃并[4,3 - b ]苯并呋喃-1-酮衍生物

基于2,3-二取代的4 H-呋喃[3,2 - c ] pyran-4的光化学反应，开发了一种新型的合成1 H-吡喃并[4,3 - b ]苯并呋喃-1-酮的方法。-那些。研究过程包括己三烯体系的光环化和随后通过消除水分子使苯环芳构化。1 H-吡喃并[4，3 - b ]苯并呋喃-1-酮衍生物之一的结构通过X射线衍射测定。