PREPARATION OF PENTAFLUOROSULFANYL (SF5) HETEROCYCLES: PYRROLES AND THIOPHENES
申请人:Zheng Zhaoyun
公开号:US20110040103A1
公开(公告)日:2011-02-17
The subject invention pertains to pentafluorosulfonyl (SF5) substituted pyrroles, thiophenes, 3-pyrrolines and 2,5-dihydrothiophenes, as well as methods for their synthesis.
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).
BALDWIN, J. E.;BOTTARO, J. C., J. CHEM. SOC. CHEM. COMMUN., 1982, N 11, 624-625