One-Step Synthesis of Pyridines and Dihydropyridines in a Continuous Flow Microwave Reactor
News Nov 18, 2013
The Bohlmann-Rahtz pyridine synthesis and the Hantzsch dihydropyridine synthesis can be carried out in a microwave flow reactor or using a conductive heating flow platform for the continuous processing of material. In the Bohlmann-Rahtz reaction, the use of a Brønsted acid catalyst allows Michael addition and cyclodehydration to be carried out in a single step without isolation of intermediates to give the corresponding trisubstituted pyridine as a single regioisomer in good yield. Furthermore, 3-substituted propargyl aldehydes undergo Hantzsch dihydropyridine synthesis in preference to Bohlmann-Rahtz reaction in a very high yielding process that is readily transferred to continuous flow processing.
This article was published online in Beilstein Journal of Organic Chemistry and is free to access.
University of Wisconsin–Madison Professor of Chemistry Shannon Stahl has received the Steenbock Professorship in Chemical Sciences. In addition to advancing the fundamental science in this area, Stahl has been involved in numerous industrial collaborations that have led to practical applications, including target applications relevant to pharmaceutical synthesis.READ MORE