Synthesis of Benzo[f]indole-4,9-dione and Benzo[b]carbazole-6,11-dione Derivatives via One-Pot Sequential C,N-Dialkylation of Enaminones of β-Diketones and Ketoesters by 2,3-Dichloronaphthoquinone - Hu, Hua-You; Liu, Yun; Ye, Miao; Xu, Jian-Hua (Synlett, 2006)