Journal
TETRAHEDRON LETTERS
Volume 53, Issue 46, Pages 6280-6287Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2012.09.034
Keywords
Dihydrophenanthridine; Dihydrobenzo[c][1,8]naphthyridine; Phenanthridine; Propylphosphonic anhydride (T3P); Pictet-Spengler reaction
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A new method has been developed for the selective synthesis of 5,6-dihydrophenanthridines, 5,6-dihydrobenzo[c][1,8]naphthyridines and their fully aromatized analogues via the Pictet-Spengler reaction mediated by propylphosphonic anhydride (T3P). The method, which uses less toxic and readily available T3P, generally seems to be more flexible, efficient in the preparation of 5,6-dihydrophenanthridine derivatives and complementary to conventional routes in the preparation of fused pyridines. (C) 2012 Elsevier Ltd. All rights reserved.
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