Studies on 3-substituted 1,2-benzisoxazole derivatives. IV. Rearrangement of N-substituted 2H-1,2-benzisoxazolin-3-one to 2-substituted 2H-1,3-benzoxazin-4-one.
作者:HITOSHI UNO、MIKIO KUROKAWA
DOI:10.1248/cpb.26.549
日期:——
The base catalyzed ring expansion of 2-substituted 2H-1, 2-benzisoxazolin-3-one (3) to 2-substituted 2H-1, 3-benzoxazin-4-one (4) was observed during the alkylation of 3-hydroxy-1, 2-benzisoxazole (1).
Direct Imine Acylation: Rapid Access to Diverse Heterocyclic Scaffolds
作者:William P. Unsworth、Christiana Kitsiou、Richard J. K. Taylor
DOI:10.1021/ol303073b
日期:2013.1.18
A simple and efficient procedure to prepare a range of diverse heterocycles by the direct acylation of imines using a variety of functionalized benzoic acids is described. The methodology features a novel method for N-acyliminium ion generation followed by in situ intramolecular trapping by oxygen-, nitrogen-, sulfur- and carbon-based nucleophiles. Preliminary mechanistic studies, using ReactIR, are also reported.
Substrate scope in the direct imine acylation of ortho-substituted benzoic acid derivatives: the total synthesis (±)-cavidine
作者:Christiana Kitsiou、William P. Unsworth、Graeme Coulthard、Richard J.K. Taylor
DOI:10.1016/j.tet.2014.04.066
日期:2014.10
The direct imine acylation (DIA) and subsequent cyclisation of a range of imines with ortho-substitutedbenzoicacid derivatives is described. Variation in the coupling reagents, imine and benzoicacid were all examined. The DIA procedure was also applied in the total synthesis of (±)-cavidine.