Caspases are responsible for the execution of the cell death program and are potentially suitable targets for the specific imaging of apoptosis in vivo. A series of N-1-substituted analogues of the small molecule nonpeptide caspase inhibitor (S)-5-[1-(2-methoxymethylpyrrolidinyl)sulfonyl]isatin (1), which may be useful for the development of caspase-targeted radioligands, were synthesized and their inhibition potencies were evaluated in vitro. Two of the most powerful techniques to introduce fluorine into organic compounds, viz, bromofluorination of olefins and fluorohydrin synthesis by ring-opening of epoxides, were used. Most of the target compounds are potent inhibitors of the two effector caspases-3 and -7. Furthermore, the (18)F-radiolabeled model compound (S)-1-[4-(1-[(18)F]fluoro-2-hydroxyethyl)benzyl]-5-[1-(2-methoxymethyl-pyrrolidinyl)sulfonyl]isatin ([(18)F]37), a putative tracer for the noninvasive imaging of apoptosis by positron emission tomography (PET) was synthesized by nucleophilic epoxide ring-opening of its precursor 36. The radiochemistry utilized in the (18)F-fluorination reverted to carrier-added [(18)F]Et(3)N.3HF, a new fluorine-18 source for radiolabeling.

β‐Halo‐β‐(trifluoromethyl)styrenes readily react with a variety of nitrogen nucleophiles bearing primary amino groups to afford either the captodative trifluoromethylated enamines or vinylogous guanidinium salts in a selective fashion depending on the electronic natures of the aromatic substituents.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

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