Transannular Reactions of Two Parallel 1,3-Butadiynes: Syntheses, Structures, and Reactions of 1Azacyclotetradeca-3,5,10,12-tetrayne Derivatives
作者:Erik M. Schmidt、Rolf Gleiter、Frank Rominger
DOI:10.1002/chem.200390208
日期:2003.4.14
boat conformation in the solid state. The reaction of 20 c with concentrated HCl in ethanol yielded 2,10-dichloro-6-isopropyl-6-azatricyclo[9.3.0.0(4,8)]tetradeca-1(11),2,4(8),9-tet raene (25 c). Compound 25 c was oxidized by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) to 27 c. The structure of the latter was confirmed by X-ray investigations. The reaction of 20 c in aqueous HCl lead to the formation
1-烷基和1-芳基-1-氮杂环十四烷基-3,5,10,12-四炔的合成是通过逐步的方法实现的。关键中间体是1,13-dibromotrideca-2,4,9,11-tetrayne(18)。与甲基(19 a),乙基(19 b),异丙基(19 c),正丁基(19 d)和叔丁胺(19 e)以及苯胺(19 f)和p反应-甲氧基苯胺(19g)得到相应的14元四炔20a-20g。通过可变温度(1)H NMR光谱研究了20b的环转化过程。从这些测量值计算出DeltaG(不相等)为10.6 kcal mol(-1)。对20b,20c和20f的单晶进行X射线研究表明,每个氮原子上取代基的轴向位置。在20 b时,我们遇到了椅子的构造,在20 c时,我们遇到了椅子和船的构造,并在固态的20 f船构型中。20 c与浓HCl在乙醇中的反应生成2,10-二氯-6-异丙基-6-氮杂三环[9.3.0.0(4,8)] tetradeca-1(11),2