Michael Reactions of α‐Unsubstituted Trisubstituted 1 H ‐Pyrroles

To obtain stable derivatives of α‐unsubstituted pyrroles, the reaction of the test pyrrole 9 with a series of chalcones 14a – h were studied. Michael adducts 16b – h could be isolated. In order to synthesize coloured derivatives, the reaction of different pyrroles 9, 21, 23 , and 25 with diphenylpropynone 19 was investigated. In these cases, too, Michael ‐addition products were formed. The intense absorption band around 400 nm makes the identification of these derivatives easy.