3-[2-[2-(3,4-Bis-tert-butoxycarbonylamino-piperidin-1-yl)-acetylamino]-2-(2,9,9-trimethyl-3,5-dioxa-4-bora-tricyclo[6.1.1.02,6]dec-4-yl)-ethyl]-2-methoxy-benzoic acid tert-butyl ester 、
三氯化硼 在
crude product 、
丙酮腈 、
水 作用下,
以to give a 29% yield of product as a white solid的产率得到3-[2-(3,4-Diamino-piperidin-1-yl)-acetylamino]-2-hydroxy-3,4-dihydro-2H-benzo[e][1,2]oxaborinine-8-carboxylic acid