Exploring the enzyme ‐catalyzed synthesis of isotope labeled cyclopropanes

In this study, the use of enzyme-catalysis for the synthesis of labeled cyclopropanes was investigated. Two readily available (modified) enzymes were studied for the cyclopropanation of substituted styrenes with ethyl diazoacetate. This diazoacetate is highly energetic; therefore, alternatives were investigated. The final optimized cyclopropanation was successfully demonstrated using n-hexyl diazoacetate and used to synthesize stereoselective 13C-labeled cyclopropanes. This optimized procedure serves as a proof-of-concept for generating stereoselective-labeled cyclopropanes. Cyclopropanes are commonly employed structural moieties in drug design since their incorporation is often associated with increased target affinity, improved metabolic stability, and increased rigidity to access bioactive conformations. Robust chemical cyclopropanation procedures have been developed which proceed with high yield and broad substrate scope, and have been applied to labeled substrates. Recently, engineered enzymes have been shown to perform cyclopropanations with remarkable diastereoselectivity and enantioselectivity, but this biocatalytic approach has not been applied to labeled substrates to date. In this study, the use of enzyme catalysis for the synthesis of labeled cyclopropanes was investigated. Two readily available enzymes, a modified CYP450 enzyme and a modifiedAeropyrum pernix protoglobin, were investigated for the cyclopropanation of a variety of substituted styrenes. For this bio...
Source: Journal of Labelled Compounds and Radiopharmaceuticals - Category: Biochemistry Authors: Tags: RESEARCH ARTICLE Source Type: research