Conformational behaviour of medium-sized rings. Part 15. 1,9,17-Triaza[2.2.2]metacyclophane-2,10,1 8-trione derivatives
作者:Farouk Eltayeb Elhadi、W. David Ollis、J. Fraser Stoddart
DOI:10.1039/p19820001727
日期:——
The stepwise synthesis of 1,9-dimethyl-1,9,17-triaza[2.2.2]metacyclophane-2,10,18-trione (1) from methyl m-aminobenzoate and m-nitrobenzoyl chloride is reported. The temperature dependences (i) of the 1H-decoupled 13C n.m.r. spectrum of the 1, 9,17-trimethyl derivative (2) and (ii) of the 1Hn.m.r. spectrum of the 1,9-dimethyl-17-benzyl derivative (3) are interpreted in terms of equilibration between
从甲基1,9-二甲基- 1,9,17三氮杂[2.2.2] metacyclophane-2,10,18三酮(1)的分步合成米-氨基苯甲酸和米报道硝基苯甲酰氯。1,9,9,17-三甲基衍生物(2)的1 H解耦的13 C nmr光谱的温度依赖性(i)和1,9-二甲基-17-苄基的1 H nmr光谱的(ii)温度依赖性导数(3)根据溶液中非对映异构体冠和鞍形构象之间的平衡进行解释。据信1,9-二甲基衍生物(1)主要存在于溶液的鞍形中。
Cyclic-tri(N-methyl-meta-benzamide)s: substituent effects on the bowl-shaped conformation in the crystal and solution states
Cyclictrimers of 3-(N-alkylamino)benzoic acid (calix[3]amides) with various substituents at the meta position of the phenyl rings were synthesized and the effects of the substituents on the crystalstructures and energy profiles in solution were examined. The calixamides existed in a syn conformation in the crystal state, and this was also the major conformation in solution, especially in polar solvents
Various tertiary benzanilide derivatives were effectively synthesized from substituted benzoic acid and N-monoalkylated aniline using dichlorotriphenylphosphorane in chloroform. Yields were generally high, even when an electron-withdrawing group substituted the aromatic ring of aniline, or when an electron-donating group substituted the aromatic ring of benzoic acid. Allyl, Boc, MPM and the Z group
Treatment of meta-(methylamino)benzoic acid (2) with tetrachlorosilane afforded several cyclic oligomers (3 – 6). All the amide bonds of the four oligomers are cis in the crystal. 1H-NMR spectra of the trimer 3 showed the existence of an equilibrium between chiral truncated cone (syn) and anti conformations.