3-[2-{2-[4-(2-Benzyloxy-ethyl)-piperazin-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 8% yield of product as a white solid的产率得到2-Hydroxy-3-{2-[4-(2-hydroxy-ethyl)-piperazin-1-yl]-acetylamino}-3,4-dihydro-2H-benzo[e][1,2]oxaborinine-8-carboxylic acid