Propargyl alcohol → (Z)-3-(Tributylstannyl)prop-2-en-1-ol

Propargyl alcohol (5 mL) was added to a solution of lithium aluminium hydride (1M in THF, 43 mL) in THF (70 mL) at −78° C. The resultant mixture was warmed to room temperature and stirred for 18 hours. It was re-cooled to −78° and a solution of tri-n-butyl tin chloride (8.32 mL) in diethyl ether (50 mL) was added and the mixture was stirred for 3 hours whilst gradually warming to room temperature. The reaction mixture was cooled to −5° C. and quenched by addition of water and 15% aqueous sodium hydroxide solution then warmed to room temperature. Ethyl acetate was added and the mixture was stirred for 1 hour. The precipitate was filtered through Celite and the filtrate was evaporated to dryness. The residue was purified by chromatography on a silica column which had been pre-washed with 20% triethylamine in acetonitrile. The column was eluted with a mixture of ethyl acetate and pentane with a gradient of 0-10% to give (Z)-3-tributylstannanyl-prop-2-en-1-ol (5.06 g) as a clear oil.

1. temperatureIt was re-cooled to −78°
2. stirringthe mixture was stirred for 3 hours
3. temperatureThe reaction mixture was cooled to −5° C.
4. customquenched by addition of water and 15% aqueous sodium hydroxide solution
5. temperaturethen warmed to room temperature
6. additionEthyl acetate was added
7. stirringthe mixture was stirred for 1 hour
8. filtrationThe precipitate was filtered through Celite
9. customthe filtrate was evaporated to dryness
10. customThe residue was purified by chromatography on a silica column which
11. washhad been pre-washed with 20% triethylamine in acetonitrile
12. washThe column was eluted with a mixture of ethyl acetate and pentane with a gradient of 0-10%

ORD record

ord-90881e1f88ff4658aca594502080ac2e

Source dataset

uspto-grants-2016_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09266896B2