A steric control of regioselectivity in palladium-catalyzed cyclizations of alkenes bearing arylbromides and nucleophiles
作者:Didier Bruyère、Gaelle Gaignard、Didier Bouyssi、Geneviève Balme、Jean-Marc Lancelin
DOI:10.1016/s0040-4039(96)02442-2
日期:1997.2
The stereocontrolled synthesis of tricyclic compounds through an efficient and highly regioselective 5-exo-trig palladium catalyzed biscyclization process is reported, starting from compounds 1. The 6-endo competing cyclization can also be the only pathway leading to trans-octahydrophenanthrene. In this finely balanced competition, it appcared that the 6-endo to 5-exo ratio is dependent upon the size
据报道,从化合物1开始,通过高效且高度区域选择性的5 exo-trig钯催化的双环化过程立体控制合成三环化合物。6-内基竞争环化也可能是导致反式-八氢菲的唯一途径。在这种精细平衡的竞争中,人们注意到6-内基对5-外基的比例取决于起始物质亲核部分的大小。