Ring expansion by in situ tethering of hydroxy azides to ketones: The boyer reaction
作者:Vijaya Gracias、Kristine E. Frank、Gregory L. Milligan、Jeffrey Aubé
DOI:10.1016/s0040-4020(97)01012-0
日期:1997.12
under the action of protic or Lewis acids such as BF3·OEt2. The reaction appears to succeed due to the initial formation of a hemiketal, which then renders the attack of azide on an oxonium ion intramolecular. The scope of this reaction vis à vis ketone and hydroxyalkyl azide structure is discussed.
尽管叠氮化物可以与酮反应形成扩环的内酰胺,但该反应的通用性差,并且需要使用强力的路易斯酸促进剂。1,2-和1,3-羟烷基叠氮化物与酮的反应在质子酸或路易斯酸(例如BF 3 ·OEt 2)的作用下以高收率生成N-羟烷基内酰胺。由于半缩醛的最初形成,该反应似乎成功,然后使叠氮化物对氧离子离子分子内的侵蚀。讨论了该反应相对于酮和羟烷基叠氮化物结构的范围。