A one-step synthesis of acridines via palladium(II)-catalysed ring formation of allylated enaminones

Abstract
9-Ethyl-3,4,5,6,9,10-hexahydroacridine-1(2H),-8(7H)-dione (5) and its N-allyl analogue (6) were formed in a one-step ring-forming reaction from both the 2-and/or N-allyl derivatives of 3-aminocyclohex-2-enone (1)–(4) and from the bisenaminone (7), obtained from the N-allylenaminone (2), on treatment with PdCl2(MeCN)2.

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