Diethyl Ether → HCID 68650060, compound

Temperature

-105 °C

A solution of N-(3-iodo-4-methylphenyl)-N,N-dimethylamine (5.22 g, 20 mmol) in 100 mL of anhydrous THF was cooled to −100° C. (liquid nitrogen/EtOH) under nitrogen. Then 1.4M solution of sec-BuLi in cyclohexane (15 mL, 21 mmol) was added dropwise at −100° C. to −90° C. The mixture was stirred at −100° C. to −90° C. for 10 min, then a solution of R-(+)-propylene oxide (1.51 g, 1.8 mL, 26 mmol) in 15 mL of THF was added dropwise at −100° C. to −90° C., then the mixture was cooled to −105° C. and a 46.5% solution of BF3 in diethyl ether (4.18 mL, 30 mmol) was added dropwise. The mixture was stirred at −100° C. to −90° C. for 2 h, then the reaction was quenched with 20 mL of sat. aq. NH4Cl at −90° C. The mixture was stirred and warmed to 0° C. overnight. Then 20 mL of water was added and mixture was extracted with EtOAc (2×60 mL), the extract was dried over Na2SO4 and evaporated to give crude oil, which was purified by column (silica gel, EtOAc/hexane 1:9, Rf=0.25 in EtOAc/hexane 3:7) to give (2R)-1-[5-(dimethylamino)-2-methylphenyl]propan-2-ol (0.15 g, 4%) as brown oil. 1H NMR (300 MHz, CDCl3): δ 7.03 (m, 1H), 6.58 (m, 2H), 4.02 (m, 1H), 2.90 (s, 6H), 2.65-2.78 (m, 2H), 2.23 (s, 3H), 1.62 (br, 1H), 1.29 (d, J=6.21 Hz, 3H).

1. stirringThe mixture was stirred at −100° C. to −90° C. for 2 h
2. customthe reaction was quenched with 20 mL of sat. aq. NH4Cl at −90° C
3. stirringThe mixture was stirred
4. temperaturewarmed to 0° C. overnight
5. additionThen 20 mL of water was added
6. extractionmixture was extracted with EtOAc (2×60 mL)
7. dry with materialthe extract was dried over Na2SO4
8. customevaporated
9. customto give crude oil, which
10. customwas purified by column (silica gel, EtOAc/hexane 1:9, Rf=0.25 in EtOAc/hexane 3:7)

ORD record

ord-6371959ba2614ebbb0d95206c449742d

Source dataset

uspto-grants-2014_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08815906B2