Synthesis of Cyclopenta[b]indol-1-ones and Carbazol-4-ones fromN-(2-Halophenyl)-Substituted Enaminones by IntramolecularHeck Reaction
作者:Ulrik S. Sørensen、Esteban Pombo-Villar
DOI:10.1002/hlca.200490020
日期:2004.1
An efficient synthetic route towards N-methylated or nonmethylated 3,4-dihydrocyclopent[b]indol-1(2H)-ones (3) and 1,2,3,9-tetrahydrocarbazol-4(4H)-one (10) was elaborated, based on Pd-catalyzed intramolecular Heck reaction. The chemoselectivity of the cyclization was studied in the case of the bi- and trifunctional substrates 12 and 17, respectively. In the latter case, depending on the catalyst,
N-甲基化或非甲基化3,4-二氢环戊[ b ]吲哚-1(2 H)-ones(3)和1,2,3,9-四氢咔唑-4(4 H)-one(10)的有效合成途径基于Pd催化的分子内Heck反应进行了详细的描述。在双官能底物12和三官能底物17的情况下,分别研究了环化的化学选择性。在后一种情况下,取决于催化剂,分别通过单Heck反应和双Heck反应获得溴化的吲哚18或四环化合物19。