中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | <1'R-(1'α,2'α,5'α)>-5,7-dimethoxy-6',6'-dimethylspiro<2H-1-benzopyran-2,2'-bicyclo<3.1.1>heptan>-4(3H)-one | 115463-47-3 | C19H24O4 | 316.397 |
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.