Phosphorus trichloride → trans-4-(t-Butyldimethylsilyloxymethyl)-2-(diethyloxyphosphinoyl)-1,3-dithiolane

HRID 365776Notes

Reaction equation

[Si:1]([O:8][CH2:9][CH:10]1[CH2:14][S:13][CH:12](OCC)[S:11]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[CH2:18]([O:20][P:21]([O:25]CC)[O:22][CH2:23][CH3:24])[CH3:19].P(Cl)(Cl)Cl>ClCCl.[Cl-].[Zn+2].[Cl-]>[Si:1]([O:8][CH2:9][C@@H:10]1[CH2:14][S:13][C@@H:12]([P:21]([O:22][CH2:23][CH3:24])([O:20][CH2:18][CH3:19])=[O:25])[S:11]1)([C:4]([CH3:5])([CH3:6])[CH3:7])([CH3:2])[CH3:3]

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of 4-(t-butyldimethylsilyloxymethyl)-2-ethoxy-1,3-dithiolane (example 48) (37.1 g, 126 mmol) and triethylphosphite (14.3 mL, 83.0 mmol, 0.66 eq) in dichloromethane (100 mL) were added phosphorus trichloride (3.6 mL, 42.0 mmol, 0.33 eq) and zinc chloride (catalytic) at 0° C. The solution was stirred at 0° C. for 2 hr and at room temperature for 18 hr. The solvent was evaporated and the crude material was purified by flash chromatography with a mixture of hexane and ethyl acetate (80:20 to 60:40) to give 3.64 g of the cis isomer, 8.62 g of the trans isomer and 9.95 g of the mixture (2:1 trans:cis) for a total yield of 46%.

Workup

customThe solvent was evaporated
customthe crude material was purified by flash chromatography with a mixture of hexane and ethyl acetate (80:20 to 60:40)

Sources & evidence

ORD record: ord-29b3323ef69a46d4afb4b04f00b1143b
Source dataset: uspto-grants-2000_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06127540

Reaction notes

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