乳清酸 、
氯化亚砜 、
potassium carbonate 、
3,4-二氢-2H-吡啶并[4,3-b]-1,4-恶嗪 在
(2,3-dihydro-pyrido[4,3-b][1,4]oxazin-4-yl)-(2,6-dihydroxy-pyrimidin-4-yl)-methanone 作用下,
以to obtain the target compound 60, i.e., (2,3-dihydro-pyrido[4,3-b][1,4]oxazin-4-yl)-(2,6-dihydroxy-pyrimidin-4-yl)-methanone的产率得到(2,3-dihydro-pyrido[4,3-b][1,4]oxazin-4-yl)-(2,6-dihydroxy-pyrimidin-4-yl)-methanone