Open-chain acetonides of D-galactono-1,4-lactone as starting materials for pyrrolidines, azepanes and 5-azidomethyltetrahydrofuran-2-carboxylates: monomers for polyhydroxylated nylon and for tetrahydrofuran carbopeptoids
Improved synthesis of 6-amino-6-deoxy-d-galactono-1,6-lactam and d-mannono-1,6-lactam from corresponding unprotected d-hexono-1,4-lactones
摘要:
Regioselective bromination of unprotected D-galactono-1,4-lactone and D-mannono-1,4-lactone with PPh3/CBr4 led to 6-bromo-6-deoxy derivatives. These intermediates were treated with LiN3 and hydrogenated to give 6-amino-6-deoxy-D-galactono-1,6-lactam (8) and 6-amino-6-deoxy-D-mannono-1,6-lactam (13) in 74 and 67% overall yield, respectively. (C) 2004 Elsevier Ltd. All rights reserved.