e.g. Filippa Pettersson or Cancer Res. 75(6) , 1102-12, (2015) or 10.1002/anie.201600521
Tetrahedron
Active manganese dioxide promoted cyclization of ortho-(1H-pyrrol-1-yl) aryl and heteroaryl carboxylic acids to 5H-pyrrolo [1, 2-a][3, 1] benzoxazin-5-one derivatives