反应详情

In the same way as in Example 31, 112 mg (0.37 mmol) of (4-(3-fluoro-2-methoxyphenyl)-2-hydroxy-2-(trifluoromethyl)hexanal, 60 mg (0.37 mmol) of 5-amino-2-ethylquinazoline and 0.2 ml of titanium tetraethoxide are reacted to give 1-[(2-ethylquinazolin-5-yl)imino]-4-(3-fluoro-2-methoxyphenyl)-2-(trifluoromethyl)hexan-2-ol. 280 mg of crude imine are cyclized in the same way as in Example 31 at −20° C. with 2.4 ml (2.4 mmol) of 1 M boron tribromide solution to give the desired product. Purification by chromatography on silica gel (ethyl acetate) gives 4 mg of desired product and 11 mg of the 8α compound (Example 49).