Diethyl (cyanomethyl)phosphonate → (3-{[Tert-butyl(diphenyl)silyl]oxy}cyclobutylidene)acetonitrile

HRID 1426282Notes

Reaction equation

HRID 1426282 reaction equation
CC(C)([O-])C.[K+].[C:7]([CH2:9]P(=O)(OCC)OCC)#[N:8].[Si:18]([O:35][CH:36]1[CH2:39][C:38](=O)[CH2:37]1)([C:31]([CH3:34])([CH3:33])[CH3:32])([C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1>O1CCCC1>[Si:18]([O:35][CH:36]1[CH2:37][C:38](=[CH:9][C:7]#[N:8])[CH2:39]1)([C:31]([CH3:33])([CH3:34])[CH3:32])([C:25]1[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1

Participants

5

Reactant 3

HCID 75676Diethyl (cyanomethyl)phosphonateHCID 23665647Potassium tert-butoxideHCID 668245053-((tert-Butyldiphenylsilyl)oxy)cyclobutanone

Product 1

HCID 66824450(3-{[Tert-butyl(diphenyl)silyl]oxy}cyclobutylidene)acetonitrile

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent3×

Procedure

To a solution of 1.0M potassium tert-butoxide in tetrahydrofuran (46.0 mL, 46.0 mmol) at 0° C. was added diethyl cyanomethylphosphonate (7.8 mL, 48 mmol). The bath was removed and the reaction mixture was allowed to warm to room temperature over 1 hour. The reaction was re-cooled to 0° C., and a solution of 3-{[tert-butyl(diphenyl)silyl]oxy}cyclobutanone (15.7 g, 48.4 mmol, from Step 3) in tetrahydrofuran (80 mL) was added. During the course of the addition, additional tetrahydrofuran (50 mL) was added into the receiving flask to facilitate stirring. Upon complete addition of the ketone, the bath was removed and the reaction allowed to reach room temperature and stirred overnight. The reaction mixture was partitioned between water and ethyl acetate and the aqueous was extracted with ethyl acetate a total of three times. The combined extracts were washed with brine, dried over sodium sulfate, decanted and concentrated. Flash chromatography, eluting with a gradient of 0-10% ethyl acetate in hexanes afforded product (16.1 g, 96%). 1H NMR (300 MHz, CDCl3): δ 7.74-7.58 (m, 4H), 7.49-7.34 (m, 6H), 5.13 (dddd, 1H), 4.34 (tt, 1H), 3.16-2.90 (m, 4H), 1.05 (s, 9H).

Workup

  1. customThe bath was removed
  2. temperatureThe reaction was re-cooled to 0° C.
  3. additionwas added into the receiving flask
  4. customthe bath was removed
  5. customto reach room temperature
  6. stirringstirred overnight
  7. customThe reaction mixture was partitioned between water and ethyl acetate
  8. extractionthe aqueous was extracted with ethyl acetate a total of three times
  9. washThe combined extracts were washed with brine
  10. dry with materialdried over sodium sulfate
  11. customdecanted
  12. concentrationconcentrated
  13. washFlash chromatography, eluting with a gradient of 0-10% ethyl acetate in hexanes afforded product (16.1 g, 96%)

Sources & evidence

ORD record
ord-b709321415854d34afcf7575ddb8a163
Source dataset
uspto-grants-2015_01
Patent number
US08933085B2

Reaction notes

Loading…