Method for the synthesis of .alpha. .beta.-unsaturated ketones
申请人:Nippon Soda Co., Ltd.
公开号:US05484949A1
公开(公告)日:1996-01-16
The present invention relates to a method for the synthesis of .alpha., .beta.-unsaturated ketones which comprises, in the method for the synthesis of .alpha., .beta.-unsaturated ketones represented by general formula ##STR1## reacting aldehydes represented by general formula R.sup.1 CHO (where R.sup.1 is as defined above) with alkali metal salt of acetoacetic acid represented by general formula ##STR2## (where M.sup..sym. is an alkali metal ion), in the presence as a catalyst of 3-azabicyclo[3,2,2]nonane, a cyclic secondary amine represented by general formula (1) ##STR3## a cyclic secondary amine represented by general formula (2) ##STR4## (where, l is 1 or more and up to 6, a ring with N is a 6-membered, 7-membered or 8-membered ring, the two neighbors of N are methylene, R.sup.3 is a lower alkyl group, its substitution position is at a carbon atom other than two those adjacent to N, and ##STR5## is an alicyclic group or a phenol group), or a secondary amine represented by general formula (3) CH.sub.3 NHCH.sub.2 R.sup.4 (3) in a mixuture solvent of water and water-insoluble organic solvent, while keeping the pH constant with mineral acid, and by adjusting an amount of water.
本发明涉及一种合成α,β-不饱和酮的方法,包括以下步骤:在一种由通式##STR1##表示的α,β-不饱和酮的合成方法中,将由通式R.sup.1CHO(其中R.sup.1如上所定义)表示的醛与由通式##STR2##(其中M.sup..sym.是一种碱金属离子)表示的乙酰乙酸盐的碱金属盐在3-azabicyclo[3,2,2]nonane存在下反应,3-azabicyclo[3,2,2]nonane是一种由通式(1)##STR3##表示的环状二级胺,或者由通式(2)##STR4##表示的环状二级胺,或者由通式(3)CH.sub.3NHCH.sub.2R.sup.4(3)表示的二级胺作为催化剂,在水和水不溶性有机溶剂的混合溶剂中,在矿酸的pH值恒定的情况下,通过调整水的量来完成反应。