... Volume: Page: ... figure Scheme 5. Synthesis of 12–15. The Heck reaction of 3-ethenyl-9-ethyl- 9H-carbazole (24) with 4,6-dichloro-2-(methylsulfanyl)pyrimidine by using a catalyst/base system of [Pd(OAc) 2 ] and (o-tolyl) 3 P/Et 3 N afforded no desired 17 and ...