反应详情

温度

-10 °C

To an oven-dried 2 L round-bottomed flask equipped with an argon inlet/outlet and magnetic stirring was added (R)-2-methyl-CBS-oxazaborolidine (7.4 mL of a 1M solution in toluend, 7.4 mmol, Aldrich). Toluene (190 mL) was added and the reaction mixture was cooled in an ice-salt bath (bath temp.=−10° C.). BH3—SMe2 was added (17 mL, 180 mmol, Aldrich), then 5-oxo-5,6,7,8-tetrahydro-naphthalene-2-carboxylic acid methyl ester (30 g, 150 mmol, Albany Molecular) in 200 mL of THF was added over 5 h using a syringe pump. After the addition was complete, the reaction mixture was stirred for an additional 1 h. The reaction mixture was allowed to stir for 72 h at RT. The reaction mixture was poured into an addition funnel, and the mixture was added to 200 mL of MeOH, cooled in a ice-salt bath, over 30 min at such a rate that the internal temperature was kept below 0° C. The mixture was concentrated in vacuo to get a solid. 1H NMR (400 MHz, DMSO-d6): δ1.35-1.50 (m, 2H), 1.55-1.75 (m, 2H), 2.30 (s, 1H), 2.35-2.60 (m, 2H), 4.22 (s, 2H), 4.33 (s, 1H), 6.78 (s, 1H), 6.87 (d, 8.0 Hz, 1H), and 7.12 (d, 8.0 Hz, 1H).

1. customTo an oven-dried 2 L round-bottomed flask equipped with an argon inlet/outlet
2. additionAfter the addition
3. stirringthe reaction mixture was stirred for an additional 1 h
4. stirringto stir for 72 h at RT
5. additionThe reaction mixture was poured into an addition funnel
6. temperaturecooled in a ice-salt bath, over 30 min at such a rate that the internal temperature
7. customwas kept below 0° C
8. concentrationThe mixture was concentrated in vacuo
9. customto get a solid