Lipase-catalyzed kinetic resolution of a series of esters having a sulfoxide group as the stereogenic centre
摘要:
A series of methyl 2-(alkylsulfinyl)benzoates (alkyl = C1, n-C4, n-C-8, n-C-12 and n-C-16) was investigated with respect to substrate behaviour and enantioselectivity in a lipase (Candida rugosa)-catalyzed hydrolytic reaction. Although three bonds separate the stereogenic centre and the ester carbonyl group, very high enantioselectivity values (>100) could be obtained. It was found that the enzyme consistently showed a strong kinetic preference for the (-)-(S)-enantiomer.
Reaction of a 2-carboxyphenyl sulfide with non-anhydrous O-(mesityl-enesulfonyl)-hydroxylamine (MSH) in excess gives the corresponding endocyclic sulfoximides, while reaction with anhydrous MSH leads to the respective sulfimides.