(1
S)-6-hydroxy-1-[(
S)-hydroxy-((
S)-2,2,4-trimethyl-[1,3]dioxolan-4-yl)-methyl]-5-methylene-2-oxa-7,9-diaza-bicyclo[4.2.2]decane-8,10-dione 在
potassium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成
(1S)-6-hydroxy-1-[(S)-hydroxy-((S)-2,2,4-trimethyl-[1,3]dioxolan-4-yl)-methyl]-7,9-dimethyl-5-methylene-2-oxa-7,9-diaza-bicyclo[4.2.2]decane-8,10-dione