(8S,8aS)-8-hydroxy-8,8a-dihydro-1H-oxazolo[3,4-a]pyridin-3(5H)-one

(8R,8aS)-8-hydroxy-8,8a-dihydro-1H-oxazolo[3,4-a]pyridin-3(5H)-one

(8S,8aR)-8-(t-butyldimethylsilyloxy)-8,8a-dihydro-1H-oxazolo[3,4-a]pyridin-3(5H)-one

(8S,8aR)-8-benzyloxy-1,5,8,8a-tetrahydrooxazolo[3,4-a]pyridin-3-one

(R)-1-Benzyl-2-(tert-butyl-dimethyl-silanyloxymethyl)-1,6-dihydro-2H-pyridin-3-one