Microwave-Assisted Piloty−Robinson Synthesis of 3,4-Disubstituted Pyrroles
摘要:
[GRAPHICS]The synthesis of N-acyl 3,4-disubstituted pyrroles can be accomplished directly from hydrazine and an aldehyde via a Piloty-Robinson pyrrole synthesis. The use of microwave radiation for the cyclization and pyrrole formation greatly reduces the time necessary for this process and facilitates moderate to good yields from hydrazine for the corresponding 3,4-disubstituted products (5-12). By simple hydrolysis, the free N-H pyrroles can be accessed after the Piloty-Robinson reaction and then used directly in the synthesis of octaethylporphyrin (H2OEP, 14) and octaethyltetraphenylporphyrin (H2OETPP, 15).
BALDWIN, J. E.;BOTTARO, J. C., J. CHEM. SOC. CHEM. COMMUN., 1982, N 11, 624-625
作者:BALDWIN, J. E.、BOTTARO, J. C.
DOI:——
日期:——
A general synthesis of pyrroles from aldehydes and ketones
作者:Jack E. Baldwin、Jeffrey C. Bottaro
DOI:10.1039/c39820000624
日期:——
The azines of enolisable aldehydes and ketones are converted into pyrroles via thermal rearrangement of the derived benzoyl derivatives and subsequent hydrazinolysis of the resulting N-benzoylpyrroles.
Microwave-Assisted Piloty−Robinson Synthesis of 3,4-Disubstituted Pyrroles
作者:Benjamin C. Milgram、Katrine Eskildsen、Steven M. Richter、W. Robert Scheidt、Karl A. Scheidt
DOI:10.1021/jo070389+
日期:2007.5.1
[GRAPHICS]The synthesis of N-acyl 3,4-disubstituted pyrroles can be accomplished directly from hydrazine and an aldehyde via a Piloty-Robinson pyrrole synthesis. The use of microwave radiation for the cyclization and pyrrole formation greatly reduces the time necessary for this process and facilitates moderate to good yields from hydrazine for the corresponding 3,4-disubstituted products (5-12). By simple hydrolysis, the free N-H pyrroles can be accessed after the Piloty-Robinson reaction and then used directly in the synthesis of octaethylporphyrin (H2OEP, 14) and octaethyltetraphenylporphyrin (H2OETPP, 15).