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A concise and scalable strategy for the total synthesis of dictyodendrin B based on sequential C-H functionalization.
A sequential CH functionalization strategy for the synthesis of the marine alkaloid dictyodendrin B is reported. Our synthesis begins from commercially available 4-bromoindole and involves six direct functionalizations around the heteroarene core as part of a gram-scale strategy towards the natural product.We are grateful to AstraZeneca, Pfizer, and EPSRC (A.K.P., F.O.
and R.H.S.) and the ERC and EPSRC for fellowships (M.J.G.).This is the author accepted manuscript. The final version is available from Wiley at http://onlinelibrary.wiley.com/doi/10.1002/anie.201500067/abstract
Discovery, synthesis and evaluation of novel reversible monoacylglycerol lipase radioligands bearing a morpholine-3-one scaffold
Monoacylglycerol lipase (MAGL) is a serine hydrolase that plays an important role in the endocannabinoid degradation in the brain. It has recently emerged as a promising therapeutic target in the treatment of neuroinflammatory and neurodegenerative diseases, such as multiple sclerosis, Alzheimer's disease and Parkinson's disease. Development of MAGL-specific radioligands for non-invasive imaging by positron-emission tomography (PET) would deepen our knowledge on the relevant pathological changes in diseased states and accelerate drug discovery. In this study, we report the selection and synthesis of two morpholine-3-one derivatives as potential reversible MAGL PET tracer candidates based on their multiparameter optimization scores. Both compounds ([11C]1, [11C]2) were radiolabeled by direct [11C]CO2 fixation and the in vitro autoradiographic studies demonstrated their specificity and selectivity towards MAGL. Dynamic PET imaging using MAGL knockout and wild-type mice confirmed the in vivo specificity of [11C]2. Our preliminary results indicate that morpholine-3-one derivative [11C]2 ([11C]RO7279991) binds to MAGL in vivo, and this molecular scaffold could serve as an alternative lead structure to image MAGL in the central nervous system.ISSN:0969-8051ISSN:0883-2897ISSN:1872-961