Palladium(<scp>ii</scp>) catalysed cascade strategy for the synthesis of dibenzo[5,6:7,8]cycloocta[1,2-<i>b</i>]indol-10-ols/-10(15<i>H</i>)-ones: easy access to 1,3,5,7-cyclooctatetraenes (COTs)
作者:Sukanya De、Moumita Jash、Chinmay Chowdhury
DOI:10.1039/d0cc06538b
日期:——
Pd(II)-catalysed cascade cyclisation of 2-(biphenylethynyl)anilines tethered to an aldehyde or cyano group leads to the formation of dibenzo[5,6:7,8]cycloocta[1,2-b]indol-10-ols 6 or dibenzo[5,6:7,8]cycloocta[1,2-b]indol-10(15H)-ones 8 with high yields (up to 95%). The reaction proceeds via amino-palladation of the alkyne followed by nucleophilic addition onto the aldehyde/cyano group. Treatment of 6 with p-TsOH·H2O
原子经济的Pd(II)催化2-(联苯基乙炔基)苯胺连接到醛基或氰基的级联环化导致形成二苯并[5,6:7,8]环辛基[1,2- b ]吲哚-10-ols 6或二苯并[5,6:7,8]环辛八[1,2 - b ]吲哚-10(15 H)-一8的产率高(高达95%)。该反应通过炔的氨基钯催化,然后亲核加成到醛/氰基上进行。用对-TsOH·H 2 O处理6平稳地提供了环辛酸酯(COT)衍生物7。