Regio- and stereoisomers of functionalized azido amino alcohols
with a cyclopentane skeleton were synthesized in enantiomerically
pure forms. Enzymatic ring cleavage of racemic 2-azabicyclo[2.2.1]hept-5-en-3-one
gave the corresponding amino acid and one enantiomer of the lactam
stereospecifically. These were protected by esterification and carbamoylation,
and then epoxidized. The resulting oxiranes underwent cleavage by
sodium azide with complementary stereoselectivities. The regioisomeric
products were easily separated by crystallization or column chromatography.
amino acids - carbocycles - nucleosides - amino
alcohols - enzymes