Effect of Substitution on the Intramolecular 1,3-Dipolar Cycloaddition of Alkene Tethered Münchnones
作者:Guillaume Bélanger、Myriam April、Étienne Dauphin、Stéphanie Roy
DOI:10.1021/jo061556t
日期:2007.2.1
dipolarophile and the münchnone on the intramolecular cycloaddition outcome was examined. It was found that either nonactivated or electron-poor alkenes can react with the münchnone if these alkenes are tethered at position 4 on the münchnone (2, R2 = alkene tether), whereas only an electron-poor alkene at position 2 (2, R3 = alkene tether) could undergo successful cycloaddition. Also, münchnones substituted
N-酰基氨基酸的化学选择性活化,慕尼黑酮生成,分子内1,3-偶极环加成和开环的序列有效地产生了官能化的多环结构,例如环戊[ b ]吡咯或两性离子双环[4.3.0]壬烷或双环[3.3]。 [0]在一个操作中给出了辛烷值。这些两性离子物质是首次分离,然后还原为双环氨基醇。考察了双极亲和物和慕尼黑酮的取代对分子内环加成反应的影响。发现如果未活化的或贫电子的烯烃都可以在慕尼黑(4,R 2=烯烃系链),而只有位置2(2,R 3 =烯烃系链)的电子贫烯可成功进行环加成。同样,在位置2处被苯基(2,R 3 = Ph)取代的慕尼黑橡胶显示出显着的反应活性,而在位置4(2,R 2 = Ph)处的苯基具有非常有限的作用。