中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (Z)-2-benzylidene-5-bromo-2,3-dihydrobenzofuran-3-ol | 1008105-81-4 | C15H11BrO2 | 303.155 |
5-溴-3-苯并呋喃酮 | 5-bromobenzofuran-3(2H)-one | 54450-20-3 | C8H5BrO2 | 213.03 |
A base-promoted formal (2+1) cycloaddition of benzofuran-derived oxadienes with bromomalonates was established that afforded benzofuranone-based spirocyclopropanes in generally good yields (up to 98%) and high diastereoselectivities (up to 91:9 dr). This reaction is the first highly diastereoselective formal (2+1) cycloaddition of benzofuran-derived oxadienes, and will contribute to the chemistry of these compounds. In addition, this approach provides an atom-economic and useful protocol for constructing benzofuranone-based spiro skeletons.