Br[C:2]1[CH:3]=[CH:4][C:5]2[O:10][CH2:9][CH:8]([CH2:11][OH:12])[O:7][C:6]=2[CH:13]=1.[CH3:14][S:15]([O-:17])=[O:16].[Na+].N1CCC[C@H]1C(O)=O.C([O-])([O-])=O.[K+].[K+]>CS(C)=O.[Cu]I>[CH3:14][S:15]([C:2]1[CH:3]=[CH:4][C:5]2[O:10][CH2:9][CH:8]([CH2:11][OH:12])[O:7][C:6]=2[CH:13]=1)(=[O:17])=[O:16]4 batches of a mixture of (7-bromo-2,3-dihydro-1,4-benzodioxin-2-yl)methanol (0.5 g, 2.0 mmol), sodium methanesulfinate (85%) (0.37 g, 3.1 mmol), CuI (0.039 g, 0.2 mmol), L-proline (0.047 g, 0.4 mmol) and K2CO3 (0.056 g, 0.4 mmol) in DMSO (4 ml) was heated under microwave radiation to 140° C. for 1 h in a nitrogen-flushed vial. The batches were mixed and diluted with water and HCl (1 N). The resulting solution was extracted with EtOAc. The combined organic phases were washed with brine, dried and purified on flash column chromatography (isooctane/EtOAc/MeOH) to give the title compound (0.89 g). MS m/z (rel. intensity, 70 eV) 244 (M+, bp), 213 (40), 165 (27), 134 (22), 79 (18).
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