Water → 3-(Tert-butoxycarbonyl)-4-(3-bromophenyl)-4-methyl-[1,2,3]-oxathiazolidine-2,2-dioxide
Reaction equation
[C:1]([O:5][C:6]([N:8]1[C:12]([C:14]2[CH:19]=[CH:18][CH:17]=[C:16]([Br:20])[CH:15]=2)([CH3:13])[CH2:11][O:10][S:9]1=[O:21])=[O:7])([CH3:4])([CH3:3])[CH3:2].[OH2:22]>CC#N>[C:1]([O:5][C:6]([N:8]1[C:12]([C:14]2[CH:19]=[CH:18][CH:17]=[C:16]([Br:20])[CH:15]=2)([CH3:13])[CH2:11][O:10][S:9]1(=[O:22])=[O:21])=[O:7])([CH3:2])([CH3:3])[CH3:4]Participants
Procedure
To a solution of 3-(tert-butoxycarbonyl)-4-(3-bromophenyl)-4-methyl-[1,2,3]-oxathiazolidine-2-oxide (10.4 g, 28 mmol) in CH3CN (50 mL) at 0° C. was added RuO4 (0.5% in stabilized aq., 50 mg, 0.1% by weight) in H2O (10 mL) and NaIO4 (8.9 g, 41.5 mmol, 1.5 eq) in H2O (35 mL). The mixture was stirred at RT for 2 h. The mixture was partitioned between Et2O (200 mL) and H2O (50 mL). The organic layer was separated and the aqueous layer was extracted with Et2O (3×50 mL). The combined organic layer was dried (Na2SO4), and concentrated to give 10.8 g (100%) of 3-(tert-butoxycarbonyl)-4-(3-bromophenyl)-4-methyl-[1,2,3]-oxathiazolidine-2,2-dioxide (DC4; R6=Me) as a white solid (˜10.8 g, yield: 100%). 1H NMR (CDCl3) 7.56 (t, J=1.8 Hz, 1H), 7.48-7.52 (m, 1H), 7.38-7.44 (m, 1H), 7.30 (t, J=8.0 Hz, 1H), 4.41 (dd, J1=9.3 Hz, J2=20.4 Hz, 2H), 2.01 (s, 3H), 1.39 (s, 9H).
Workup
- customThe mixture was partitioned between Et2O (200 mL) and H2O (50 mL)
- customThe organic layer was separated
- extractionthe aqueous layer was extracted with Et2O (3×50 mL)
- dry with materialThe combined organic layer was dried (Na2SO4)
- concentrationconcentrated
Sources & evidence
- ORD record
- ord-b155860b143b477288e17ca48cbe145f
- Source dataset
- uspto-grants-2014_04
- Patent number
- US08691831B2
Reaction notes
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