Process for preparing (2E,6Z)-2,6-nonadienal and a process for preparing (2E)-cis 6,7-epoxy-2-nonenal
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US10662166B2
公开(公告)日:2020-05-26
Provided herein are convenient and efficient processes for preparing (2E,6Z)-2,6-nonadienal and (2E)-6,7-epoxy-2-nonenal with a reduced number of steps.
For instance, provided herein is a process for preparing (2E,6Z)-2,6-nonadienal, including at least steps of subjecting a (6,6-dialkoxy-4-hexenylidene)triarylphosphorane compound of the general formula:
Ar3P═CH(CH2)2CH═CHCH(OR1)(OR2) to a Witting reaction with propanal to form a 1,1-dialkoxy-(6Z)-2,6-nonadiene compound of the general formula (6); and subjecting the 1,1-dialkoxy-(6Z)-2,6-nonadiene compound to hydrolysis to form (2E,6Z)-2,6-nonadienal. Also provided is a process for preparing (2E)-cis-6,7-epoxy-2-nonenal of the formula (8), comprising a step of subjecting (2E,6Z)-2,6-nonadienal thus obtained to epoxidation to form (2E)-cis-6,7-epoxy-2-nonenal.
本发明提供了制备(2E,6Z)-2,6-壬二烯醛和(2E)-6,7-环氧-2-壬烯醛的方便有效的工艺,减少了步骤数。
例如,本发明提供了一种制备(2E,6Z)-2,6-壬二烯醛的工艺,至少包括以下步骤:将通式为(6,6-二烷氧基-4-亚己烯基)的三芳基磷烷化合物:
Ar3P═CH(CH2)2CH═CHCH(OR1)(OR2)与丙醛进行Witting反应,生成通式(6)的1,1-二烷氧基-(6Z)-2,6-壬二烯化合物;以及将1,1-二烷氧基-(6Z)-2,6-壬二烯化合物进行水解,生成(2E,6Z)-2,6-壬二烯醛。还提供了一种制备式(8)的(2E)-顺式-6,7-环氧-2-壬烯醛的工艺,包括将由此获得的(2E,6Z)-2,6-壬二烯醛进行环氧化反应生成(2E)-顺式-6,7-环氧-2-壬烯醛的步骤。