Cycloadditions of aromatic imines to enantiomerically pure stabilized azomethine ylids: Construction of threo (2S, 3R)-3-aryl-2,3-diamino acids
摘要:
Chiral stabilized azomethine ylids derived from reaction of (5S)-phenylmorpholin-2-one (1) with aromatic imines undergo efficient and highly diastereocontrolled cycloaddition with a second molecule of imine to furnish products which may be converted into enantiomerically pure threo (2S, 3R)-3-aryl-2,3-diamino acids. (C) 1997 Elsevier Science Ltd. All rights reserved.
A Convenient Route to Enantiopure 3-Aryl-2,3-diaminopropanoic Acids by Diastereoselective Mannich Reaction of Camphor-Based Tricyclic Iminolactone with Imines
A novel and convenient route to the asymmetric synthesis of 2,3-diamino acids via Mannich reaction of iminolactones 1a and 1b with N-protected imines has been achieved in good yields (up to 95%) and high diastereoselectivity (dr: >99:1). Hydrolysis of the Mannich adducts under acidic conditions furnished the desired 3-aryl-2,3-diaminopropanoic acids in good yields (up to 85%) with excellent enantiomeric