tert-butyl 3-((2R)-2-(2-(3-(tert-butoxycarbonyl(2-(tert-butoxycarbonylamino)ethyl)amino)cyclobutyl)acetamido)-2-(2,9,9-trimethyl-3,5-dioxa-4-bora-tricyclo[6.1.1.0
2,6]dec-4-yl)ethyl)-2-methoxybenzoate 、
三氯化硼 在
crude product 作用下,
生成
(R)-3-(2-(3-(2-aminoethylamino)cyclobutyl)acetamido)-2-hydroxy-3,4-dihydro-2H-benzo[e][1,2]oxaborinine-8-carboxylic acid