반응 #1359356
ord-2b41990edc55402d81498d97e5c95782
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후처리
- 1workup.ADDITIONwas added dropwise
- 2온도maintaining the temperature below −70° C
- 3workup.WAITThe resultant dark red solution was left
- 4workup.WAITThe mixture was left
- 5workup.STIRRINGto stir at −78° C. for 2 h
- 6workup.WAITleft
- 7온도to warm to room temperature over 2 h
- 8workup.ADDITIONthe mixture was poured onto an isolute HM-N SPE cartridge
- 9세척eluted with ethyl acetate (10 mL)
- 10기타The eluent was evaporated under reduced pressure
- 11기타the crude material was purified by reverse phase preparative HPLC (Prep Nova-Pak HR
실험 절차
A solution of n-butyl lithium (1.6 M in hexanes, 0.5 mL, 0.8 mmol) in tetrahydrofuran (5 mL) was stirred at −78° C. for 5 min. under an argon atmosphere. A mixture of (4R,9aR)-6-bromo-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester (0.2 g, 0.54 mmol) in tetrahydrofuran (5 mL) was added dropwise, maintaining the temperature below −70° C. The resultant dark red solution was left to stir at −78° C. for 30 min then ethyl disulfide (0.13 mL, 1.08 mmol) was added. The mixture was left to stir at −78° C. for 2 h, then left to warm to room temperature over 2 h. Water (1 mL) was added and the mixture was poured onto an isolute HM-N SPE cartridge and eluted with ethyl acetate (10 mL). The eluent was evaporated under reduced pressure and the crude material was purified by reverse phase preparative HPLC (Prep Nova-Pak HR C18 6 mm 60 Å 30 mm×300 mm column, UV detection at 254 nm, mobile phase 95:5 methanol:water and 10 mmol ammonium acetate, gradient 50 methanol to 100% 0 to 10 min then 100% methanol to 13 min, 20 mL/min) to give the title compound (0.071 g, 53% yield) as a pale yellow oil: m/z M+ 350.14 (M+1); HPLC (50% to 80% gradient [95:5 MeOH:water, 10 mmol ammonium acetate] 220 nm XTERRA 2.0 mL/min) 6.21 min.