Abstract
The synthesis of a new trifluoromethyl oxetane was developed using a Corey-Chaykovsky epoxidation/ring-expansion reaction of trifluoromethyl ketones. The reaction was shown to proceed under mild conditions and displays a broad substrate scope. The trifluoromethyl oxetane was also evaluated as a tert-butyl isostere in the context of the γ-secretase modulator (GSM) program. We demonstrate that the trifluoromethyl oxetane-containing GSM has decreased lipophilicity, improved lipophilic efficiency (LipE) and metabolic stability relative to the corresponding tert-butyl GSM analogue, thus highlighting several benefits of trifluoromethyl oxetane as a more polar tert-butyl isostere.
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