(8S,11S,14S)-14-[(tert-butoxycarbonyl)amino]-11-{(2R)-3-[(tert-butoxycarbonyl)amino]-2-hydroxypropyl}-5,17-dihydroxy-9-methyl-10,13-dioxo-9,12-diazatricyclo[14.3 .1.1{2,6}]henicosa-1(20),2(21),3,5,16,18-hexaene-8-carboxylic acid 、 glutaminamide hydrochloride 在
N,N-二异丙基乙胺 、
Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
以13%的产率得到tert-butyl {(2R)-3-[(8S,11S,14S)-8-({[(1S)-4-amino-1-(aminocarbonyl)-4-oxobutyl]amino} carbonyl)-14-[(tert-butoxycarbonyl)amino]-5,17-dihydroxy-9-methyl-10,13-dioxo-9,12-diazatricyclo[14.3.1.1{2,6}]henicosa-1( 20),2(21),3,5,16,18-hexaen-11-yl]-2-hydroxypropyl} carbamate