Nickel-catalyzed coupling reaction of sterically congested cis bromides and lithium alkenylborates
作者:Yuichi Kobayashi、Yuji Nakayama、Ryo Mizojiri
DOI:10.1016/s0040-4020(97)10206-x
日期:1998.2
Lithium alkenyl borates of general structure 5 (RT=alkenyl) couple with cis bromides 1 at room temperature overnight in the presence of NiCl2(PPh3)2 as a catalyst to furnish dienes of general structure 3 with retention of the olefin geometries present in both coupling partners. By using this reaction, cis, trans dienes 3 (R=TBDMS, TES, TBDPS; R1=n-C5H11, c-C6H11, R2=H; R3=n-C5H11, Ph) and cis,cis diene
通式5的烯基硼酸锂(R T =烯基)在室温下在作为催化剂的NiCl 2(PPh 3)2存在下与顺式溴化物1偶联过夜,以提供通式3的二烯并保留存在的烯烃几何结构在两个耦合伙伴中。通过使用该反应,顺式,二烯3(R = TBDMS,TES,TBDPS; R 1=n -C 5 H 11,c -C 6 H 11,R 2= H; R3 = n -C 5 H 11,Ph)和顺式,顺式二烯3(R = TBDMS; R 1 = R 2 = n -C 5 H 11; R 3 = H)以高收率合成。