... In addition, the Sonogashira–Hagihara reaction in triethylamine (instead of THF) in the presence of Ph3P was found to improve the yield of 6. 35) Kubota S., Horie K., Misra HK, Toyooka K., Uda M., Shibuya M., Terada H., Chem. Pharm. Bull., 33, 662—666 (1985). ...