中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1-(5,7-dimethoxy-2,2-dimethyl-2H-chromen-6-yl)ethanone | 18780-97-7 | C15H18O4 | 262.306 |
—— | 1-(5,7-dimethoxy-2,2-dimethyl-2H-chromen-8-yl)ethanone | 31367-55-2 | C15H18O4 | 262.306 |
—— | 6-(2-aminobenzoyl)-5,7-dimethoxy-2,2-dimethylchromene | 59190-68-0 | C20H21NO4 | 339.391 |
—— | 6-(2-N-methylaminobenzoyl)-5,7-dimethoxy-2,2-dimethylchromene | 79228-40-3 | C21H23NO4 | 353.418 |
The reaction of a phenol, and α,β-unsaturated aldehyde, and phenylboronic acid yields a 2-phenyl-4H-1,3,2-benzodioxaborin. Upon heating, this compound decomposes to an orthoquinone-methide intermediate, which undergoes an electrocyclization reaction to a chromene ring system. This method has been applied to the synthesis of precocenes I and II and the robustadial A and B.