Efficient palladium-catalysed cascade cyclisation to form spiroindoles is developed. Treatment of indoles bearing a propargyl chloride side chain at the 3-position with various external nucleophiles in the presence of a catalytic amount of Pd2(dba)3·CHCl3/dppb and Cs2CO3 in THF gives fused tetracyclic spiroindoles in moderate to good yields.
高效
钯催化的级联环化反应合成螺
吲哚已被开发。在Pd2(dba)3·
CHCl3/dppb和Cs2CO3的催化下,将带有3-位炔
氯侧链的
吲哚与各种外部亲核试剂在THF中反应,可以中等至良好产率得到融合的四环螺
吲哚。