Ca. Busacca et Y. Dong, Synthesis of 4-(p-methoxyphenyl)-beta-carboline, a new inhibitor of cellular calcium influx, SYN COMMUN, 30(3), 2000, pp. 501-509
4-(p-methoxyphenyl)-beta-carboline was prepared in four steps from indole.
The key step involved palladium-catalyzed dehydrogenation of a dihydro-beta
-carboline dichlorophosphinic acid salt. The success of the dehydrogenation
was found to depend on the catalyst support.