Synthesis and Characterization of 22‐, 28‐ and 32‐Membered Mercuraazamacrocycles: Isolation of Ring‐Chain Tautomer and Se/Te‐Containing Macrocycles
作者:Shikha Das、Harkesh B. Singh、Ray J. Butcher
DOI:10.1002/ejic.201800562
日期:2018.11.25
Schiff base macrocycles [Hg‐1,1′‐C6H‐2,3,4‐(OCH3)3‐6,6′‐(CHN)}2‐ C3H6SeC3H6]2 (10), [Hg‐1,1′‐C6H‐2,3,4‐(OCH3)3‐6,6′‐(CHN)}2‐C3H6TeC3H6]2 (11), and mercuraazametallocryptand [Hg‐1,1′‐C6H‐2,3,4‐(OCH3)3‐6,6′‐(CHN)}2‐N(C2H4)3}]2 (12) were obtained by (2+2) condensation of bis(6‐formyl‐2,3,4‐trimethoxy}phenyl)mercury(II) (7) with 3,3′‐selenobis/telluorobis‐1‐propanamine and tris(2‐aminoethyl)amine respectively
[HG-1-C的无金属合成6 ħ 4 -2-(咪唑)} 1'-C 6 H ^ 4( - CHN-CH -2' 2)}] 2(图8a)通过实现( 2 + 2)将二(2-甲酰基苯基)汞(II)(6)与二亚乙基三胺进行环缩合。大环以互变异构体8a和[Hg- 1,1'-(C 6 H 4)2 -2,2'-(CHN)} 2 -C 2 H 4 NHC 2 H 4 ] 2(8b)的混合物形式存在)。汞促进了环化作用···N分子间的相互作用。互变异构体的DFT计算比18 kcal mol –1有利于环互变异构体8a的形成而不是链互变异构体8b的形成。的混合物的还原图8a和8b中与硼氢化钠,得到28元的减少mercuraazamacrocycle [HG-的混合物1,1' - (C 6 H ^ 4)2 -2,2' - (CH 2 NH)} 2 - C 2 H 4 NHC 2 H 4 ] 2(12)和8a。大循环[Hg-