ChemInform Abstract: Palladium‐Catalyzed Cycloaddition of Alkynyl Aryl Ethers to Allenes to Form a 2,3‐Bismethylidene‐2,3‐dihydro‐4H‐1‐benzopyran Framework.

Abstract

Palladium-Catalyzed Cycloaddition of Alkynyl Aryl Ethers to Allenes to Form a 2,3-Bismethylidene-2,3-dihydro-4H-1-benzopyran Framework. -The palladium-catalyzed cycloaddition of alkynyl aryl ethers (I) to various allenes gives benzopyran derivatives. The diene moieties of the cycloadducts are used as diene reaction partners in further Diels-Alder reactions to form linearly condensed tetracycles [cf. (VII)]. -(MINAMI, Y.; KANDA, M.; HIYAMA*, T.; Chem. Lett. 43 (2014) 2, 181-183, http://dx.doi.org/10.1246/cl.130894 ; Res. Dev. Initiative, Chuo Univ., Bunkyo, Tokyo 112, Japan; Eng.) -M. Bohle 41-156