Studies in chromone derivatives: cycloaddition reactions of 4-oxo 4h-1-benzopyran-3-carboxaldehyde imines with benzonitrile oxide and nitrilimine of 4-oxo-4h-1-benzopyran-3-carboxaldehyde with alkenes
作者:Arpan Kumar Baruah、Dipak Prajapati、Jagir Singh Sandhu
DOI:10.1016/s0040-4020(01)85904-4
日期:1988.1
The chromone imines 1 and benzonitrile oxide reacted regiospecifically to yield Δ2-1,2,4 oxadiazolinyl chromones 2 in good yields. Also the preparation of a novel dipole 6 derived from 3-formylchromone and its cycloaddition reactions with a variety of alkenes which gave pyrazolinyl chromones 7 is described.
色酮亚胺1和苄腈乙烷反应区域专一性,得到Δ 2 -1,2,4- oxadiazolinyl色酮类2以良好的收率。还描述了由3-甲酰基色酮衍生的新型偶极子6的制备及其与各种烯烃的环加成反应,从而得到吡唑啉基色酮7。