The versatile conversion of lactams to the α-alkylated azacycles via cyclic N,O-acetal TMS ether
摘要:
The efficient preparation of the cyclic N,O-acetals from lactams by DIBAL reduction followed by direct trapping of the resulting N,O-hemiacetals using TMSOTf/pyridine system is described. In addition, the facile nucleophilic addition of various carbon nucleophiles at the carbonyl carbons of the lactams through the corresponding N,O-acetals is also reported. (C) 2002 Published by Elsevier Science Ltd.
developed a novelelectrosyntheticsystem for anodicsubstitutionreactions by usingparallellaminarflow in a microflowreactor. This system enables nucleophilic reactions to overcome the restraint, such as the oxidation potential of nucleophiles and the stability of cationic intermediates, by the combined use of ionic liquids as reaction media and the parallellaminarflow in the microflowreactor. By using