(propionyloxy)methyl ((formylmethoxy)carbonyl)methylcarbamate 、 glycine rifabutin 在
三乙酰氧基硼氢化钠 作用下,
以
二氯甲烷 为溶剂,
以61%的产率得到[2-[2-[[2-[(7S,9E,11S,12R,13S,14R,15R,16S,17S,18S,19E,21Z)-13-acetyloxy-2,15-dihydroxy-11-methoxy-3,7,12,14,16,18,22-heptamethyl-1'-(2-methylpropyl)-6,23,32-trioxospiro[8,33-dioxa-24,27,29-triazapentacyclo[23.6.1.14,7.05,31.026,30]tritriaconta-1(31),2,4,9,19,21,25,29-octaene-28,4'-piperidine]-17-yl]oxy-2-oxoethyl]amino]ethoxy]-2-oxoethyl]carbamoyloxymethyl propanoate