作者:J.J. Burger、T.B.R.A. Chen、E.R. De Waard、H.O. Huisman
DOI:10.1016/s0040-4020(01)93684-1
日期:1980.1
The isomeric chlorosulfones 3, 4 and 5 are prepared by 1,4-addition of sulfonyl chlorides to isoprene, Dehydrohalogenation affords the corresponding 2- and 3-methylbutadienyl sulfones in a configuration which is dependent on the configuration of the chlorosulfone. Pure Z-2-methylbutadienyl sulfones 1 are obtained by displacement of primary halides by the Z-sulfinate anion 2. The Z-sulfones 1 are isomerized
异构chlorosulfones 3,4和5是由1,4-加成磺酰氯为异戊二烯制备的脱卤化氢,得到的配置,其是依赖于chlorosulfone的配置相应的2-和3- methylbutadienyl砜。通过Z-亚磺酸根阴离子2取代伯卤化物,可得到纯Z -2-甲基丁二烯基砜1。所述ž砜1异构化成E / Z -mixtures。将E / Z混合物分离成它们的组分,并且通过NMR-NOE技术确定异构体的构型。
[EN] NEW INTERMEDIATES FOR THE VITAMIN A AND ß-CAROTENE SYNTHESIS<br/>[FR] NOUVEAUX INTERMÉDIAIRES POUR LA SYNTHÈSE DE LA VITAMINE A ET DU ?-CAROTÈNE
申请人:DSM IP ASSETS BV
公开号:WO2012175398A1
公开(公告)日:2012-12-27
The present invention relates to compounds of formula (I) wherein R1 signifies a C1-C15 alkyl moiety or a C2 to C18 alkenyl moiety, to their process of production as well as to their use in organic synthesis, especially as intermediates (building blocks) in the synthesis of vitamin A or β-carotene or derivatives thereof, or other carotenoids, e.g. canthaxanthin, astaxanthin or zeaxanthin, preferably vitamin A.