4-[5-(4,4,5,5-Tetramethyl[1,3,2]dioxaborolan-2-ylpiperazine-1-carboxylic acid tert-butyl ester4-[5-(4,4,5,5-Tetramethyl[1,3,2]dioxaborolan-2-ylpiperazine-1-carboxylic acid tert-butyl ester 97%