acid. Allylic migration in these tricyclic tetrahydroisoquinolines occurred with high stereospecificity, with the major products 9 (from 8) and 15a (from 13) apparently deriving from a concerted suprafacial [3,3] rearrangement. The rearrangement of 8 to 9 was facile at 23 degrees C (t(1/2) = ca. 5 h) and was >98% stereospecific, whereas the rearrangement of 13 to 15a/15b required heating between 50
N-烯丙基烯胺可以进行[3,3]σ重排,称为3-氮杂-Cope(或
氨基-克莱森)反应。我们探索了3-氮杂-Cope反应,涉及N-烯丙基en季
铵盐中从氮到碳的1,3烯丙基迁移,例如苯并[a]
喹啉嗪8和
吡咯并[2,1-a]
异喹啉13,在立体
化学和机理上。分别通过羟基胺4和11a / 11b的立体定向烯丙基化获得盐8和13,得到7和12a / 12b,将其用
三氟乙酸脱
水。这些
三环四氢异喹啉中的烯丙基迁移以高立体定向性发生,主要产物9(来自8)和15a(来自13)显然源自协同的表面上的[3,3]重排。8到9的重排在23摄氏度(t(1/2)=约5小时)时很容易,并且> 98%的立体定向性,而13至15a / 15b的重排需要在50至100摄氏度之间加热,约 90-95%的立体定向度(t(1/2)= 100摄氏度时约0.3小时)。用21((2)H-13)进行的
氘标记实验证实,烯丙基反转伴随1,3迁