[1]Benzothieno[3,2-b]furan reacts with substituted dienes 2 as a dienophile under formation of substituted tetrahydro[1]benzothieno[3,2-b][1]benzofuran derivatives 3-14. The cycloaddition is endo-stereoselective. Aromatization of the products leads to a series of new fused [1]benzothieno[3,2-b][1]benzofurans 17-24. The 1H NMR spectra of the new compounds were fully assigned.
苯并噻吩[3,2-b]呋喃与取代二烯[2]作为烯丙烃反应,形成取代的四氢[1]苯并噻吩[3,2-b][1]苯并呋喃衍生物3-14。环加成反应是内式立体选择性的。产物的芳香化导致一系列新的融合[1]苯并噻吩[3,2-b][1]苯并呋喃17-24。新化合物的1H NMR光谱已被完全确定。