作者:Hendrik Zipse、Ingmar Held、Shangjie Xu
DOI:10.1055/s-2007-965973
日期:2007.4
Derivatives of 3,4-diaminopyridine have been synthesized and studied as catalysts for acyl-transfer reactions. The design of these catalysts is guided by the stability of their acetyl intermediates as determined through theoretical calculations at the B3LYP/6-311 + G(d,p)//B3LYP/6-31G(d) level of theory. The most promising catalysts have been synthesized through a three- to five-step synthesis starting from 3,4-diaminopyridine. The catalytic activity has been determined for the acylation of 1-ethynylcyclohexanol with acetic anhydride at 23 °C and with isobutyric anhydride at 40 °C. For both reactions, the catalytic activity depends dramatically on the substitution pattern of the diaminopyridines. Best results are obtained with catalysts containing alkyl substituents at both amine nitrogens.
3,4-二氨基吡啶衍生物已被合成并研究其作为酰基转移反应的催化剂。这些催化剂的设计是基于通过B3LYP/6-311 + G(d,p)//B3LYP/6-31G(d)理论水平的理论计算确定的它们的乙酰基中间体的稳定性。最有希望的催化剂是通过以3,4-二氨基吡啶为起始原料的三到五步合成得到的。在23°C下用乙酸酐和40°C下用异丁酸酐对1-炔基环己醇进行酰化反应来测定催化活性。对于这两种反应,催化活性都显著依赖于二氨基吡啶的取代模式。在两个氨基氮原子上都含有烷基取代基的催化剂获得了最好的结果。