In the BaylisâHillman reaction of N-benzylidene-4-methylbenzenesulfonamide with cyclohex-2-en-1-one or cyclopent-2-en-1-one, we found that, in the presence of a catalytic amount of DMAP, the BaylisâHillman reaction can be greatly accelerated to give the normal BaylisâHillman adduct 1 or 3 in good or very high yields; moreover, using PBu3 as a Lewis base in the reaction of N-benzylidene-4-methylbenzenesulfonamide with cyclopent-2-en-1-one, the normal BaylisâHillman adducts 3 could be obtained in very high yields within 5 h, however, using PBu3 or DBU as a Lewis base in the reaction of N-benzylidene-4-methylbenzenesulfonamide with cyclohex-2-en-1-one, besides the normal BaylisâHillman adduct 1 abnormal BaylisâHillman adduct 3-aryl-2-[(4-methylphenyl)sulfonyl]-2-azabicyclo[2.2.2]octan-5-one 2 was formed at the same time; the substituentâs effects were also examined.
在N-苄叉-4-甲基苯磺酰胺与环己-2-烯-1-酮或环戊-2-烯-1-酮的Baylis-Hillman反应中,我们发现,在催化量的
DMAP存在下,Baylis-Hillman反应可以大大加速,以良好或非常高的产率得到正常的Baylis-Hillman加合物1或3;此外,在N-苄叉-4-甲基苯磺酰胺与环戊-2-烯-1-酮的反应中使用PBu3作为Lewis碱,可以在5小时内以非常高的产率得到正常的Baylis-Hillman加合物3,然而,在N-苄叉-4-甲基苯磺酰胺与环己-2-烯-1-酮的反应中使用PBu3或
DBU作为Lewis碱,除了正常的Baylis-Hillman加合物1外,还同时形成了异常的Baylis-Hillman加合物3-芳基-2-[(4-甲基苯基)磺酰基]-
2-氮杂双环[2.2.2]辛-5-酮2;还考察了取代基效应。