1: With 1,3-bis-(diphenylphosphino)propane; hypophosphorous acid; triethylamine; palladium diacetate in N,N-dimethyl-formamide
T=85°C; 15 h;
2: With oxygen in N,N-dimethyl-formamide
T=110°C; 22 h; Further stages.;
Mio, Matthew J; Kopel, Lucas C; Braun, Julia B; Gadzikwa, Tendai L; Hull, Kami L; Brisbois, Ronald G; Markworth, Christopher J; Grieco, Paul A
Organic letters, 2002 , vol. 4, # 19 p. 3199 - 3202