tert-butyl 2-methoxy-3-((2R)-2-(2-(pyridin-3-ylmethyl)isoindoline-5-carboxamido)-2-(2,9,9-trimethyl-3,5-dioxa-4-bora-tricyclo[6.1.1.0
2,6]dec-4-yl)ethyl)benzoate 、
三氯化硼 在
crude product 作用下,
生成
(R)-2-hydroxy-3-(2-(pyridin-3-ylmethyl)isoindoline-5-carboxamido)-3,4-dihydro-2H-benzo[e][1,2]oxaborinine-8-carboxylic acid