乙酸酐 、
(S)-2-tert-Butoxycarbonylamino-4-((2S,3R,4R,5R,6R)-3,4,5-trihydroxy-6-hydroxymethyl-tetrahydro-pyran-2-yl)-butyric acid methyl ester 在
4-二甲氨基吡啶 吡啶 作用下,
以
二氯甲烷 为溶剂,
生成 methyl 6,7,8,10-tetra-O-acetyl-5,9-anhydro-2,3,4-trideoxy-2-(tert-butoxycarbonylamino)-D-threo-L-galacto-deconate