Barton esters for initiator-free radical cyclisation with heteroaromatic substitution
作者:Robert Coyle、Karen Fahey、Fawaz Aldabbagh
DOI:10.1039/c3ob27313j
日期:——
first examples of efficientradicalcyclisation with (hetero)aromatic substitution via Barton ester intermediates. Cyclopropyl and alkyl radicals allow access to five, six and seven-membered alicyclic-ring fused heterocycles with and without an additional fused cyclopropane, including the skeleton of the anti-cancer agent, cyclopropamitosene, expanded, and diazole analogues. Radical initiators are not
The present application provides the compounds of formula I or IA
or pharmaceutically acceptable salts, isomers, tautomer, or a mixture thereof,
wherein s, t, m, n, R
1
, R
2
, R
3
, R
4
, R
5
, R
6
and R
7
are as described herein.