Benzyl-{(1R,2R,3S)-3-hydroxy-2-((S)-4-isopropyl-2-thioxo-thiazolidine-3-carbonyl)-1-[2-((S)-4-isopropyl-2-thioxo-thiazolidin-3-yl)-2-oxo-ethyl]-butyl}-carbamic acid benzyl ester 在
potassium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成
Benzyl-[(2S,3R,4R)-3-((S)-4-isopropyl-2-thioxo-thiazolidine-3-carbonyl)-2-methyl-6-oxo-tetrahydro-pyran-4-yl]-carbamic acid benzyl ester