N-propionyl-5-aza-1S,6S:7R,8R-di-O-isopropylidene-3,10-dioxa-[4,4,01,6]-decan-4-one 在
N-溴代丁二酰亚胺(NBS) 、
lithium diisopropyl amide 作用下,
生成 、 (1S,2R,6R,9S)-13-[(2R)-2-bromopropanoyl]-4,4,15,15-tetramethyl-3,5,8,11,14,16-hexaoxa-13-azatetracyclo[7.4.3.01,9.02,6]hexadecan-12-one