반응 #1885033

반응 방정식

tert-butyl-2,5-dihydro-1H-pyrrole-1-carboxylate

4-chloro-3-methylbenzenediazonium tetrafluoroborate

methanol

→

tert-butyl 4-(4-chloro-3-methylphenyl)-2-methoxypyrrolidine-1-carboxylate

수율 88.0%

용매

ethyl acetate

반응 조건

후처리

1. 1
   기타Synthesized
2. 2
   기타partitioned with saturated aqueous NaHCO3 solution (150 mL)
3. 3
   기타The organic layer was removed
4. 4
   세척washed with saturated aqueous NaHCO3 solution (150 mL), brine (150 mL)
5. 5
   건조dried over MgSO4
6. 6
   농축concentrated under reduced pressure
7. 7
   기타The residue was dried under vacuum

실험 절차

Synthesized according to General Procedure 2. To a stirred solution of tert-butyl-2,5-dihydro-1H-pyrrole-1-carboxylate (2.5 g, 14.8 mmol) in methanol (75 mL) under N2 at RT was added 4-chloro-3-methylbenzenediazonium tetrafluoroborate (5.3 g, 22.2 mmol), followed by the addition of palladium(II) acetate (336 mg, 1.50 mmol). The resulting solution was stirred at RT for 1 hour, diluted with ethyl acetate (375 mL) and partitioned with saturated aqueous NaHCO3 solution (150 mL). The organic layer was removed and washed with saturated aqueous NaHCO3 solution (150 mL), brine (150 mL), dried over MgSO4 and concentrated under reduced pressure. The residue was dried under vacuum to afford tert-butyl 4-(4-chloro-3-methylphenyl)-2-methoxypyrrolidine-1-carboxylate (4.25 g, 13.0 mmol, 88% yield) as a brown oil. The crude product was used without any further purification in the next reaction step. 1H-NMR (400 MHz, DMSO-d6) δ 7.35-7.26 (m, 2H), 7.16 (dd, J=1.9, 8.2 Hz, 1H), 5.20-5.05 (m, 1H), 3.70-3.63 (m, 1H), 3.54-3.45 (m, 1H), 3.28 (s, 3H), 3.21-3.10 (m, 1H), 2.30 (s, 3H), 2.10-1.98 (m, 2H) and 1.47 (s, 9H) ppm.

출처