申请人:Toyotama Perfumery Co., Ltd.
公开号:US05627288A1
公开(公告)日:1997-05-06
Disclosed are 3,7-dimethyl-4-oxo-7-octenoic acid and its alkyl esters which are intermediates for producing a fragrance, rosefuran and which are represented by: ##STR1## where R is H or a lower alkyl. The compounds [1] are obtained by reacting 2-methyl-3-alkoxycarbonylpropionic acid halide and 3-methyl-3-butenylmagnesium halide. The octenoic acid [1] is treated with acetic anhydride under heat in the presence of an acidic catalyst to give 3,7-dimethyl-2,6-octadien-4-olide. The olide is reduced in an ordinary manner to give rosefuran.
揭示了3,7-二甲基-4-氧代-7-辛烯酸及其烷基酯,它们是生产香精玫瑰呋喃的中间体,并且表示为:##STR1##其中R为H或较低的烷基。化合物[1]通过反应2-甲基-3-烷氧羰基丙酸卤和3-甲基-3-丁烯基镁卤得到。辛烯酸[1]在酸性催化剂存在下在热条件下与乙酸酐反应,生成3,7-二甲基-2,6-辛二烯-4-酮。这种酮类化合物通常通过还原方法还原成玫瑰呋喃。