A mild and efficient dearomatic [3＋2] annulation reaction of 3-nitro-7-azaindoles and Morita Baylis Hillman carbonates from isatins was developed catalyzed by DMAP, affording the corresponding polycyclic spirooxindol...A mild and efficient dearomatic [3＋2] annulation reaction of 3-nitro-7-azaindoles and Morita Baylis Hillman carbonates from isatins was developed catalyzed by DMAP, affording the corresponding polycyclic spirooxindoles containing fused azaindoline architectures and vicinal quaternary centers in excellent yields（up to 96%） with high regio- and diastereoselectivity（dr 〉 19：1）. Moderate enantioselectivity（79% ee） was obtained by employing a chiral DMAP-type Lewis base catalyst.展开更多
A novel Dendritic Compound (2) of triphenylene- 2,6,10-trione ketal-tri-{2,2-di-[(N-methyl-N-(4-py- ridinyl) amino)methyl]-1,3-propanediol} was conveniently synthesized by aromatization of cyclohexanedione mono-ketal,...A novel Dendritic Compound (2) of triphenylene- 2,6,10-trione ketal-tri-{2,2-di-[(N-methyl-N-(4-py- ridinyl) amino)methyl]-1,3-propanediol} was conveniently synthesized by aromatization of cyclohexanedione mono-ketal, ketal-exchange reaction with 2,2-dibromomethyl-1,3-propane- diol and nuclophilic substitution with N-methy- laminopyridine as nuclophilic reagent. The Mo-rita-Baylis-Hillman reaction of various aryl al-dehydes with methyl vinyl ketone and acryloni-trile in (DMF/cyclohexane, 1/1, v/v) has been investigated by using Dendritic Compound (2) as catalyst. The corresponding Morita-Baylis- Hillman adducts was obtained in good yields by using the recycled and reactivated dendritic catalyst.展开更多
以三甲胺、1,4-重氮二环[2,2,2]辛烷(DABCO)为催化剂,室温合成了19个Baylis-Hillman加成物(BH),生物活性测试发现:在2000 g a.i./ha的剂量下,2-((2,4-二氯苯基)(羟基)甲基)丙烯酸甲酯(BH-7)具有较为广谱的除草活性,对阔叶杂草百日草和...以三甲胺、1,4-重氮二环[2,2,2]辛烷(DABCO)为催化剂,室温合成了19个Baylis-Hillman加成物(BH),生物活性测试发现:在2000 g a.i./ha的剂量下,2-((2,4-二氯苯基)(羟基)甲基)丙烯酸甲酯(BH-7)具有较为广谱的除草活性,对阔叶杂草百日草和苘麻的防效达到100%;对禾本科杂草稗草和马唐的防效分别为80%和75%;在25g a.i./ha的剂量下3-(羟基(4-硝基苯基)甲基)丁-3-烯-2-酮(BH-18)对番茄晚疫病的防效为100%,对稻瘟病及蔬菜灰霉病的防效均为50%。展开更多
基金financial support from the NSFC(21572135 and 21321061)
文摘A mild and efficient dearomatic [3＋2] annulation reaction of 3-nitro-7-azaindoles and Morita Baylis Hillman carbonates from isatins was developed catalyzed by DMAP, affording the corresponding polycyclic spirooxindoles containing fused azaindoline architectures and vicinal quaternary centers in excellent yields（up to 96%） with high regio- and diastereoselectivity（dr 〉 19：1）. Moderate enantioselectivity（79% ee） was obtained by employing a chiral DMAP-type Lewis base catalyst.
文摘A novel Dendritic Compound (2) of triphenylene- 2,6,10-trione ketal-tri-{2,2-di-[(N-methyl-N-(4-py- ridinyl) amino)methyl]-1,3-propanediol} was conveniently synthesized by aromatization of cyclohexanedione mono-ketal, ketal-exchange reaction with 2,2-dibromomethyl-1,3-propane- diol and nuclophilic substitution with N-methy- laminopyridine as nuclophilic reagent. The Mo-rita-Baylis-Hillman reaction of various aryl al-dehydes with methyl vinyl ketone and acryloni-trile in (DMF/cyclohexane, 1/1, v/v) has been investigated by using Dendritic Compound (2) as catalyst. The corresponding Morita-Baylis- Hillman adducts was obtained in good yields by using the recycled and reactivated dendritic catalyst.
文摘以三甲胺、1,4-重氮二环[2,2,2]辛烷(DABCO)为催化剂,室温合成了19个Baylis-Hillman加成物(BH),生物活性测试发现:在2000 g a.i./ha的剂量下,2-((2,4-二氯苯基)(羟基)甲基)丙烯酸甲酯(BH-7)具有较为广谱的除草活性,对阔叶杂草百日草和苘麻的防效达到100%;对禾本科杂草稗草和马唐的防效分别为80%和75%;在25g a.i./ha的剂量下3-(羟基(4-硝基苯基)甲基)丁-3-烯-2-酮(BH-18)对番茄晚疫病的防效为100%,对稻瘟病及蔬菜灰霉病的防效均为50%。
