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。