A study of Heck cyclization reactions to form phenanthridine ring systems
作者:Lauren R. Donaldson、David Haigh、Alison N. Hulme
DOI:10.1016/j.tet.2008.02.044
日期:2008.5
survey of conditions for the palladiumcatalyzed intramolecular Heck cyclization of protected amines has shown that the Herrmann–Beller palladacycle can be exploited under ‘cationic’ conditions to provide a robust and rapid route (<2 h) to the synthesis of single double bond isomer phenanthridines in excellent yield (76–99%). In addition, the same cyclization can be performed under ‘neutral’ conditions
对钯催化的受保护胺的分子内Heck环化条件的研究表明,可以在“阳离子”条件下利用Herrmann-Beller palladacycle,以提供可靠且快速的路线(<2小时)来合成单双键异构体菲啶的收率极高(76–99%)。此外,可以在“中性”条件下进行相同的环化反应,以提供具有双键异构体特征的菲啶,适用于基于多样性的应用。我们还表明,高反应性(t Bu 3 P)2 Pd催化剂可在低温(≤50°C)下诱导环化,与“中性”条件产生相似的结果,并为敏感底物提供替代途径。