10.1021/ol802792g.s001 Michael E. Jung Michael E. Jung Damian A. Allen Damian A. Allen Use of 4-Cyanocoumarins as Dienophiles in a Facile Synthesis of Highly Substituted Dibenzopyranones American Chemical Society 2009 silyloxy groups cyano silyloxydiene Dienophile dibenzopyranones 14 cycloaddition adducts 13 Cyanocoumarin Diel cyanocoumarin synthesis Facile Synthesis Substituted Dibenzopyranones 2009-02-05 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Use_of_4_Cyanocoumarins_as_Dienophiles_in_a_Facile_Synthesis_of_Highly_Substituted_Dibenzopyranones/2880916 A new synthesis of dibenzopyranones <b>14</b> is reported via the Dielsāˆ’Alder cycloaddition of 4-cyanocoumarins <b>12</b> with 1-silyloxydienes <b>10</b> to give the adducts <b>13</b> which are then converted into <b>14</b> in one step via treatment with base and loss of the cyano and silyloxy groups.