Synthesis and NMR Conformational Studies ofp-tert-Butyldihomooxacalix[4]arene Derivatives Bearing Pyridyl Pendant Groups at the Lower Rim
作者:Paula M. Marcos、José R. Ascenso、J. L. C. Pereira
DOI:10.1002/1099-0690(200209)2002:17<3034::aid-ejoc3034>3.0.co;2-i
日期:2002.9
O-alkylation of p-tert-butyldihomooxacalix[4]arene (1) with 2-(chloromethyl)pyridine hydrochloride and NaH in DMF provided six of the nine possible (2-pyridylmethoxy)dihomooxacalix[4]arene conformers in the cone conformation. Mono- and tetrasubstituted derivatives were obtained, as well as all four (1,2-, 1,3-, 1,4- and 2,3-) types of disubstituted compounds. The conformations and the substitution patterns were
在 DMF 中对叔丁基二高氧杂杯 [4] 芳烃 (1) 与 2-(氯甲基) 吡啶盐酸盐和 NaH 的直接 O-烷基化提供了九种可能的 (2-吡啶基甲氧基) 二高氧杂杯 [4] 芳烃构象异构体中的六种锥形构象. 获得了单和四取代的衍生物,以及所有四种(1,2-、1,3-、1,4- 和 2,3-)类型的双取代化合物。构象和取代模式通过 NMR 光谱(1H、13C、COSY、NOESY 和 TOCSY 1D)确定。从同一反应中,还分离并表征了另一种 1,2-交替 A 构象的四取代衍生物 (6)。(© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)