Gold‐Catalyzed Annulations of 1‐(2,3‐Butadienyl)‐1
<i>H</i>
‐Indole Derivatives
作者:José Barluenga、María Piedrafita、Alfredo Ballesteros、Ángel L. Suárez‐Sobrino、José M. González
DOI:10.1002/chem.201001754
日期:2010.10.18
Gold‐ringing! Modification of the substitution at C2 drives an entirely different cyclization of N‐tethered allenylindoles. An efficient cycloisomerization takes place for the case of R being hydrogen, that is, compatible with additional functional groups. A methyl at C2 precludes this possibility and launches a stepwise process that can be tuned to yield macrocyclic trimers.