Cesium fluoride-mediated claisen rearrangement of aryl propargyl ether and its application to the synthesis of chelerythrine.
作者:Hisashi ISHII、Tsutomu ISHIKAWA、Sunao TAKEDA、Satoshi UEKI、Masahiro SUZUKI、Takashi HARAYAMA
DOI:10.1248/cpb.38.1775
日期:——
In the presence of cesium fluoride, the Claisen rearrangement of aryl propargyl ethers selectively provided 2-methylbenzofurans, which was successively treated with osmium tetroxide, periodic acid and 5% sodium hydroxide to give salicylaldehydes in good yields. The method was used to synthesize chelerythrine (2) via the common intermediate (8) prepared by the two routes as shown in Chart 3.
在氟化铯存在下,芳基丙炔醚的克莱森重排选择性地提供了 2-甲基苯并呋喃,依次用四氧化锇、定期酸和 5%氢氧化钠处理后得到水杨醛,收率很高。如图 3 所示,该方法通过两种路线制备的共同中间体 (8) 合成了白屈菜红碱 (2)。