Methanol → 2-[6-(1,4-Dioxaspiro[4.5]dec-8-yloxy)-2-(trifluoromethyl)pyrimidin-4-yl]ethanol

HRID 2200800Notes

Reaction equation

HRID 2200800 reaction equation
[O:1]1[C:5]2([CH2:10][CH2:9][CH:8]([O:11][C:12]3[N:17]=[C:16]([C:18]([F:21])([F:20])[F:19])[N:15]=[C:14]([CH2:22][C:23](OCC)=[O:24])[CH:13]=3)[CH2:7][CH2:6]2)[O:4][CH2:3][CH2:2]1.[BH4-].[Na+].CO>O1CCCC1>[O:4]1[C:5]2([CH2:10][CH2:9][CH:8]([O:11][C:12]3[N:17]=[C:16]([C:18]([F:20])([F:21])[F:19])[N:15]=[C:14]([CH2:22][CH2:23][OH:24])[CH:13]=3)[CH2:7][CH2:6]2)[O:1][CH2:2][CH2:3]1

Participants

5

Reactant 3

HCID 887MethanolHCID 4311764Sodium borohydrideHCID 71266703Ethyl [6-(1,4-dioxaspiro[4.5]dec-8-yloxy)-2-(trifluoromethyl)pyrimidin-4-yl]acetate

Product 1

HCID 712573092-[6-(1,4-Dioxaspiro[4.5]dec-8-yloxy)-2-(trifluoromethyl)pyrimidin-4-yl]ethanolYield 112.1%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Ethyl [6-(1,4-dioxaspiro[4.5]dec-8-yloxy)-2-(trifluoromethyl)pyrimidin-4-yl]acetate (3.0 g) was dissolved in tetrahydrofuran (40 mL), and cooled in an ice bath. Sodium tetrahydroborate (884 mg, 23.4 mmol) was added followed by methanol (4.8 mL, 120 mmol), in portions. The reaction mixture was stirred for 20 min, removed the ice bath, and stirred at 21° C. for 0.5 hour. HPLC & LCMS showed no remaining ester, and showed conversion to the desired M+H 349; and also showed several over reduction products (at least one of which has no UV absorbance). The reaction mixture was quenched with water and evaporated. The reaction mixture was diluted with aqueous bicarbonate and EtOAc, and stirred for 0.5 hour. The EtOAc layer was washed with brine, dried (Na2SO4), and evaporated to give 3.0 g oil. The product was purified by chromatography on a 120 g silica gel column, using solvent A=hexane; solvent B=3% iPA/EtOAc; flow 60 mL/min; A, 3 min; Gradient to 50% B in 30 min, then 50% B for 15 min; detector set at 254 nm; collected 47 mL fractions; retention time, 34 min. evaporated to yield 1.5 g, a light yellow viscous oil, 56% yield. 1H NMR (300 MHz, DMSO-D6): δ7.10 (s, 1H); 5.20 (m, 1H, OCH); 4.71 (t, 1H, OH); 3.85 (s, 4H, OCH2); 3.72 (q, 2H, OCH2); 2.85 (t, 2H, CH2); 1.5-2.0 (m, 8H).

Workup

  1. temperaturecooled in an ice bath
  2. customremoved the ice bath
  3. stirringstirred at 21° C. for 0.5 hour
  4. customThe reaction mixture was quenched with water
  5. customevaporated
  6. additionThe reaction mixture was diluted with aqueous bicarbonate and EtOAc
  7. stirringstirred for 0.5 hour
  8. washThe EtOAc layer was washed with brine
  9. dry with materialdried (Na2SO4)
  10. customevaporated

Sources & evidence

ORD record
ord-abe8ac81aaed4dfbb33ea3df93bdcbe9
Source dataset
uspto-grants-2016_06
Patent number
US09359358B2

Reaction notes

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