2,2'-(7,8-dichloro-1 H -benzo[ b ][1,4]diazepine-2,4-(3 H ,5 H )diylidene) 二乙酸二甲酯 ( 1a ) 和二甲基 2的异构体,2'-(7,8-dichloro-3-methyl-1 H -benzo[ b ][1,4]diazepine-2,4-(3 H ,5 H )diylidene) diacetate ( 1b ) 由1 H、13 C 和15 N 核磁共振 (NMR) 光谱。在 CDCl 3溶液中,观察到二氮杂环倒置,而在 ( D 6 )DMSO 和 ( D 7)DMF 溶液,除了环反转外,一个螯合环的部分裂解出现与环外 C=C 键之一的( E / Z ) 异构化有关。基于 B3PW91-SCRF/ZVP DFT 计算计算吉布斯自由能 (ΔG) 和自由活化能 (ΔG ≠ )。发现 NMR 数据和密度泛函理论 (DFT)
3,5-Dioxopimelates as new synthetic building blocks. Cyclocondensation with 1,2-, 1,3- and 1,4-dinucleophiles
摘要:
Cyclocondensation reactions of 3,5-dioxopimelates, new and versatile synthetic building blocks, with hydrazines, urea, thiourea and phenylene-1,2-diamines allow for a convenient synthesis of various heterocycles containing two ester-substituted side-chains. (C) 2012 Elsevier Ltd. All rights reserved.