Cyclodehydration of N-(Aminoalkyl)benzamides under Mild Conditions with a Hendrickson Reagent Analogue
摘要:
Methods for the cydodehydration of N-(aminoalkyl)benzamides are few and employ harsh reaction conditions. We have found that the easily prepared phosphonium anhydrides 1 (Hendrickson reagent) or 2 can be used for cyclodehydration of N-(aminoalkyl)benzamides under very mild conditions (room temperature) to produce five-, six-, and seven-membered cyclic amidines. Good yields are obtained by employing a temporary trityl group protection strategy. Cyclic analogue 2 can be used when the product cyclic amidine is organic-soluble, thus producing water-soluble byproducts.
Use of lanthanide(III) ions as catalysts for the reactions of amines with nitriles
作者:John H. Forsberg、Vincent T. Spaziano、Trichey M. Balasubramanian、Gordon K. Liu、Steven A. Kinsley、Charles A. Duckworth、John J. Poteruca、Paul S. Brown、Judith L. Miller
DOI:10.1021/jo00382a009
日期:1987.3
96. Amidines. Part VI. Preparation of 2-substituted 4 : 5-dihydroglyoxalines and ring homologues from cyanides and alkylenediamines