(4S,7R)-(-) and (4S,7S)-(+)-4-isopropylidene-7-methyl-4,5,6,7-tetrahydro-2(1)H-indazoles 2a and 2b have been successfully separated by using HPLC over a Chiralpak AS column as the stationary phase, yielding up to 700 mg of each diastereomer. Their absolute configurations were determined by using vibrational circular dichroism (VCD) studies. This latter method proved not only very useful for determination of the conformers' distribution, but also for analysis of the 1H,2H tautomers. (c) 2007 Elsevier Ltd. All rights reserved.
                                    (4S,7R)-(-) 和 (4S,7S)-(+)-4-异丙叉基-7-甲基-4,5,6,7-四氢-2(1)H-
吲哚[唑]衍
生物 2a 和 2b 已经通过使用 Chiralpak AS 柱作为固定相的高效
液相色谱法成功分离,每种非对映体可获得高达 700 mg 的产量。它们的绝对构型通过振动圆二色法(
VCD)研究确定。此方法不仅对确定构象分布非常有用,还对分析 1H,2H 能态和酮式结构的研究具有帮助。© 2007 Elsevier Ltd. 保留所有权利。