substituted 4-halo-2H-chromenes were synthesized from the corresponding 4-chromanones and phosphorus trihalides.
Gabbutt Christopher D., Hartley David J., Hepworth John D., Heron B. Mark+, Tetrahedron, 50 (1994) N 8, S 2507- 2522
作者:Gabbutt Christopher D., Hartley David J., Hepworth John D., Heron B. Mark+
DOI:——
日期:——
Synthesis and reactivity of some 4-bromo- 2H-chromenes and 2H-thiochromenes
作者:Christopher D Gabbutt、David J Hartley、John D Hepworth、B.Mark Heron、Magan Kanjia、M.Moshfiqur Rahman
DOI:10.1016/s0040-4020(01)86967-2
日期:1994.2
synthesis of 4-bromo- 2H-chromenes and 2H-thiochromenes and of 1-bromo-3,4-dihydronaphthalene from the corresponding ketones and PBr3 is described. In some instances, significant quantities of the phosphonic acids (3) are isolated. Conversion of the bromo compounds to the lithio derivatives provides access to a wide range of novel 4-substituted 2H-chromenes and 2H-thiochromenes.