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
Electrochemical Deallylation of α-Allyl Cyclic Amines and Synthesis of Optically Active Quaternary Cyclic Amino Acids
作者:Peter G. Kirira、Masami Kuriyama、Osamu Onomura
DOI:10.1002/chem.200903512
日期:2010.4.6
Electrochemical oxidation of α‐allylated and α‐benzylated N‐acylated cyclic amines by using a graphite anode easily affords the corresponding α‐methoxylated products with up to 76 % yield. Ease of oxidation was affected by the type of electrode, the size of cyclic amine, and the nature of the protecting group. This method was successfully applied to the synthesis of optically active N‐acylated α‐alkyl‐α‐amino
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.