Abstract
Algal transformations of three cyclic β-keto esters, methyl 2-oxocyclopentanecarboxylate (MCPC), ethyl 2-oxocyclohexanecarboxylate (ECHxC), and methyl 2-oxocycloheptanecarboxylate (MCHpC) were photoautotrophically studied with an axenic strain of Chlorella pyrenoidosa Chick. The three cyclic β-keto esters were transformed in two manners; reduction of the carbonyl group to a hydroxy group and elimination of the alkoxycarbonyl group. The former reaction occurred more often than the latter. The cis/trans ratios of the resulting alcohols in MCPC, ECHxC and MCHpC were 13 : 87, 15 : 85, and 65 : 35, respectively. The alkoxycarbonyl group elimination products were as follows: cyclopentanone and cyclopentanol in MCPC, cyclohexanone and cyclohexanol in ECHxC, and cycloheptanone in MCHpC.
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