Chiroptical properties of C2-symmetric N-haloaziridines. Chiral rules for the N-haloaziridine chromophore
作者:G. V. Shustov、A. V. Kachanov、V. A. Korneev、R. G. Kostyanovsky、A. Rauk
DOI:10.1021/ja00075a048
日期:1993.11
Haloaziridines 1a,b are an example of the «pure» N-haloaziridine chromophore which has the first Cotton effect (CE) in the region of 260-300 nm. A quadrant rule which connects the first CE sign with the stereochemical environment of the chromophore is offered. Haloaziridinecarboxylic esters are a specific case of the N-haloaziridine chromophore. The second CE sign at 220-230 nm in the CD spectra of these
C 2 -对称氮丙啶(2S,3S)-1-卤素-2,3-二甲基氮丙啶1a,b和(2S,3S)-1-卤素-2的N-氯(a)和N-溴(b)衍生物,获得3-双(烷氧基羰基)氮丙啶2a,b和3a,b。卤代氮丙啶 1a、b 是“纯”N-卤代氮丙啶发色团的一个例子,它在 260-300 nm 范围内具有第一棉花效应 (CE)。提供了将第一个 CE 符号与发色团的立体化学环境联系起来的象限规则。卤代氮丙啶羧酸酯是 N-卤代氮丙啶发色团的一种特殊情况。这些化合物的 CD 光谱中 220-230 nm 处的第二个 CE 符号遵循反向象限规则