Cesium carbonate → (6aR,9aS)-5,6a,7,8,9,9a-hexahydro-5-methyl-3-(phenylamino)-1-((tetrahydro-2H-pyran-4-yl)methyl)-cyclopent[4,5]imidazo[1,2-a]pyrazolo[4,3-e]pyrimidin-4(1H)-one

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A mixture of (6aR,9aS)-5,6a,7,8,9,9a-hexahydro-5-methyl-3-(phenylamino)-cyclopent[4,5]imidazo[1,2-a]pyrazolo[4,3-e]pyrimidin-4(2H)-one (50 mg, 0.155 mmol), 4-(iodomethyl)-tetrahydro-2H-pyran (70 mg, 0.310 mmol), and Cs2CO3 (101 mg, 0.310 mmol) in DMF (1 mL) is heated in microwave at 140° C. for 30 min. After cooling, the mixture is filtered through a 0.45 μm microfilter, and the filtrate is purified by a semi-preparative HPLC to give pure product as white powder. MS (ESI) m/z 421.2 [M+H]+.

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