Structure-Activity Relationship Studies of Aryl Sulfoxides as Reversible Monoacylglycerol Lipase Inhibitors.

Monoacylglycerol lipase (MAGL) is the key enzyme for the hydrolysis of endocannabinoid 2-arachidonoylglycerol (2-AG). The central role of MAGL in the metabolism of 2-AG makes it an attractive therapeutic target for a variety of disorders, including inflammation-induced tissue injury, pain, multiple sclerosis, and cancer. Previously, we reported , an aryl sulfoxide, as a peripherally restricted, covalent reversible MAGL inhibitor that reduced neuropathic pain and inflammation in preclinical models. Here, we describe the structure-activity relationship (SAR) of aryl sulfoxides as MAGL inhibitors that led to the identification of . Optimization of the potency of high-throughput screening (HTS) hit yielded compound . However, was not metabolically stable due to its ester moiety. Replacing the ester group with α-CF ketone led to the identification of compound () as a metabolically stable MAGL inhibitor with subnanomolar potency. is a promising compound to harness the therapeutic potential of MAGL inhibition.