for the following products
2H-Cyclopenta[b]furan-2-one, 4-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]hexahydro-5-[(tetrahydro-2H-pyran-2-yl)oxy]-, (3aR,4S,5R,6aS)- | 4-(tert-Butyldi-me-sio-me)hexa-H-5-(tert-h-pyr an-2-yloxy)-cyclopenta(b)furan-2-on and (3aR,4S,5R,6aS)-4-(tert-butyldimethylsilyloxy)methyl-5-tetrahydropyranyloxy-hexahydro-2H-cyclopenta[b]furan-2-one
