申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US20190106374A1
公开(公告)日:2019-04-11
One object of the invention is to provide a method for preparing a 9,9-dialkoxy-7-nonynoate ester and (7E)-7,9-decadienoate ester, which are valuable as intermediates. The method for preparing a (7E)-7,9-decadienoate ester (5) comprises at least steps of: hydrolyzing a 9,9-dialkoxy-7-nonenoate ester (2), R
3
O(R
2
O)CHCH═CH(CH
2
)
5
CO
2
R
1
, to form a (7E)-9-oxo-7-nonenoate ester (3); and subjecting the (7E)-9-oxo-7-nonenoate ester (3) to a Wittig reaction with a triarylphosphonium methylide (4), Ar
3
P═CH
2
, to form the (7E)-7,9-decadienoate ester (5). The 9,9-dialkoxy-7-nonenoate ester may be prepared by, for example, reducing a 9,9-dialkoxy-7-nonynoate ester (1).
该发明的一个目的是提供一种制备9,9-二烷氧基-7-壬烯酸酯和(7E)-7,9-癸二烯酸酯的方法,这些化合物作为中间体具有很高的价值。制备(7E)-7,9-癸二烯酸酯(5)的方法至少包括以下步骤:水解9,9-二烷氧基-7-壬烯酸酯(2),R3O(R2O)CHCH═CH(CH2)5CO2R1,形成(7E)-9-氧代-7-壬烯酸酯(3);将(7E)-9-氧代-7-壬烯酸酯(3)与三芳基膦甲烯基化合物(4),Ar3P═CH2,进行威蒂格反应,形成(7E)-7,9-癸二烯酸酯(5)。可以通过还原9,9-二烷氧基-7-壬炔酸酯(1)来制备9,9-二烷氧基-7-壬烯酸酯。