Synthesis of novel 5‐chlorinated 2‐aminothiophenes using 2,5‐dimethylpyrrole as an amine protecting group
作者:Zita Puterová、Tomáš Bobula、Daniel Végh
DOI:10.1002/jhet.5570450124
日期:2008.1
free positions of 2,5-dimethylpyrrole were substituted. To direct chlorination to the thiophene ring acetamido derivative was prepared first and then chlorinated. Transamination with hexane-2,5-dione created a 2,5-dimethyl pyrrole ring from the acetamido group. In the final step, after treatment with hydroxylamine dihydrochloride, the pyrrole ring is removed and a free amino group is regenerated.