作者:Lutz F. Tietze、Sönke Petersen
DOI:10.1002/1099-0690(200105)2001:9<1619::aid-ejoc1619>3.0.co;2-t
日期:2001.5
The estrane 4 was synthesized by two successive Heck reactions starting from enantiopure 2 and the cyclohexenone 5, which contains a (Z)-bromovinyl group. The first intermolecular Pd-catalyzed reaction leads to 10 in a highly regio- and diastereoselective manner. Transformation of the enone 10 to give the corresponding enol triflate 14 followed by an intramolecular Heck reaction affords the cyclized
雌二醇 4 是通过两个连续的 Heck 反应合成的,从对映纯 2 和环己烯酮 5 开始,环己烯酮 5 含有 (Z)-溴乙烯基。第一个分子间 Pd 催化的反应以高度区域和非对映选择性的方式产生 10。将烯酮 10 转化为相应的烯醇三氟甲磺酸酯 14,然后进行分子内 Heck 反应,以高产率提供具有环 B 和 C 的不寻常顺式连接的环化产物 4。