trifluoroacetic acid in dichloromethane

1: (4-bromo-6-tert-butoxycarbonylaminopyridin-2-yl)carbamic acid tert-butyl ester With methoxybenzene; trifluoroacetic acid in dichloromethane 2: n-valeryl chloride With pyridine in dichloromethane T=20°C;