乙酸酐 、
(2R,3R,4R,4aS,10aR)-2-(hydroxymethyl)-3,4,4a,5,10,10a-hexahydro-2H-pyrano[3,2-b]quinoxaline-3,4-diol 在
4-二甲氨基吡啶 作用下,
以80%的产率得到Acetic acid (2R,3R,4R,4aS,9aR)-3-acetoxy-2-acetoxymethyl-9,10-diacetyl-3,4,4a,9,9a,10-hexahydro-2H-1-oxa-9,10-diaza-anthracen-4-yl ester