How is 7,7-Dimethyl-5,7-dihydroindeno[2,1-b]carbazole (CAS: 1257220-47-5) typically synthesized?

7,7-Dimethyl-5,7-dihydroindeno[2,1-b]carbazole (CAS: 1257220-47-5) is typically synthesized via a multistep process involving aromatic amination and cyclization reactions. These reactions can be carried out using a variety of catalysts, such as palladium or rhodium complexes, to achieve high selectivity and yield. The synthetic route usually involves the use of aryl halides and amines under appropriate reaction conditions, followed by hydrogenation to introduce the hydroxide group.