异丙基溴化镁 、
Propanedioic acid, monoethyl ester 、
2-(2,3-dihydro-6-methyl-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-2-methylpropanoic acid 、
N,N'-羰基二咪唑 、
imidazolide 在
盐酸 、 (MgSO4),evaporated 、
ethyl acetate n-hexane 作用下,
以
四氢呋喃 、
乙醚 为溶剂,
反应 14.0h,
以to give ethyl 4-(2,3-dihydro-6-methyl-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-4-methyl-3-oxo-pentanoate (1.4 g), NMR 1.25(3H, t), 1.47(6H, s), 1.94(3H, s), 3.60(2H, s), 4.15(2H, q), 5.26(2H, s), 7.2-7.4(5H, m)的产率得到ethyl 4-(2,3-dihydro-6-methyl-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-4-methyl-3-oxo-pentanoate