Carbocyclic Ring Closure of an Aminodeoxy HEX-5-Enopyranoside

Abstract
Ferrier''s intramolecular carbocyclic ring closure reaction of methyl 3,4-di-O-acetyl-2-benzoylamino-2,6-dideoxy-.alpha.-D-xylo-hex-5-enopyranoside (2) led to 2L-2,4,5/3-2,3-di-O-acetyl-4-benzoylamino-5-hydroxycyclohexanone (4). Upon acetylation compound 4 underwent .beta.-elimination to give the conjugated enone 5. The convenient preparation of these highly functionalized aminocyclohexanones offers an efficient route to monoamino- or 1,4-diaminocyclitol-type aminoglycoside antibiotic aglycones, starting from 2-amino-2-deoxy-D-glucose.