4-[5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)pyridin-2-yloxy]piperidine-1-carboxylic acid isopropyl ester 、 (S)-trifluoromethanesulfonic acid 4-[2-tert-butoxycarbonylamino-3-((S)-3-fluoropyrrolidin-1-yl)-3-oxopropyl]3-fluorophenyl ester 生成 (S)-4-(5-{4-[2-tert-butoxycarbonylamino-3-((S)-3-fluoropyrrolidin-1-yl)-3-oxopropyl]-3-fluorophenyl}pyridin-2-yloxy)piperidine-1-carboxylic acid isopropyl ester