Stereochemistry and chiroptical properties of 1,3-dialkylaziridinones (α-lactams). Chiral rules for the nonplanar amide chromophore
作者:G. V. Shustov、A. V. Kachanov、I. I. Chervin、R. G. Kostyanovsky、A. Rauk
DOI:10.1139/v94-043
日期:1994.2.1
Structural features, configurational stability, and chiroptical properties of the nonplanar amide group in α-lactams were investigated by means of ab initio (6-31 + G*) molecular orbital calculations on (1R)-aziridinone 1, (1R)-1-methylaziridinone 2, (1R,3R)-3-methylaziridinone 3, (1R,3R)-1,3-dimethylaziridinone 4a, its cis diastereomer (1S,3R)-1,3-dimethylaziridinone 4b, and (1R,3R)-3-tert-butyl-1-methylaziridinone
通过对 (1R)-氮丙啶酮 1, (1R)-1- 从头计算 (6-31 + G*) 分子轨道计算,研究了 α-内酰胺中非平面酰胺基团的结构特征、构型稳定性和手性光学特性甲基氮丙啶酮 2、(1R,3R)-3-甲基氮丙啶酮 3、(1R,3R)-1,3-二甲基氮丙啶酮 4a、其顺式非对映异构体 (1S,3R)-1,3-二甲基氮丙啶酮 4b 和 (1R,3R)- 3-叔丁基-1-甲基氮丙啶酮 5,以及 1-叔丁基-和 1-(1'-金刚烷基)-取代的 3(R)-3-叔丁基氮丙啶酮 6 和 7 的实验 CD 光谱。 4a 和 4b 的反转势垒分别为 2.8 和 1.6 kcal mol-1。所有氮丙啶酮的最低激发单线态是价态(nO-πCO* 跃迁);第二个是里德堡态(nN-3s 跃迁)。