2,3-di-O-benzyl-4-deoxy-L-erythro-pentose trimethylene dithioacetal 、
乙酸酐 在
5-O-acetyl-2,3-di-O-benzyl-4-deoxy-L-erythro-pentose trimethylene dithioacetal 作用下,
以to produce 5-O-acetyl-2,3-di-O-benzyl-4-deoxy-L-erythro-pentose trimethylene dithioacetal [Compound 69] of the formula的产率得到5-O-acetyl-2,3-di-O-benzyl-4-deoxy-L-erythro-pentose trimethylene dithioacetal