cis-4-(t-Butyldimethylsilyloxymethyl)-2-(diethyloxyphosphinoyl)-1,3-dithiolane → cis 2-(Diethyloxyphosphinoyl)-4-hydroxymethyl-1,3-dithiolane

HRID 481717Notes

Reaction equation

[Si]([O:8][CH2:9][C@H:10]1[CH2:14][S:13][C@@H:12]([P:15]([O:20][CH2:21][CH3:22])([O:17][CH2:18][CH3:19])=[O:16])[S:11]1)(C(C)(C)C)(C)C>CO.C(Cl)(=O)C.[Cl-].[NH4+]>[CH2:18]([O:17][P:15]([O:20][CH2:21][CH3:22])([C@H:12]1[S:11][C@@H:10]([CH2:9][OH:8])[CH2:14][S:13]1)=[O:16])[CH3:19]

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of cis-4-(t-butyldimethylsilyloxymethyl)-2-(diethyloxyphosphinoyl)-1,3-dithiolane (example 49) (3.70 g, 9.56 mmol) in anhydrous methanol (50 mL) was added acetyl chloride (6 drops) at 0° C. The solution was stirred at 0° C. for 30 min and then at room temperature for 4.5 hrs. A saturated solution of ammonium chloride (3 drops) was added and the solution was stirred for 15 min followed by evaporation of solvents. The crude material was purified by flash chromatography with a mixture of dichloromethane and methanol (95:5) to give the compound (2.02 g) in 77% yield. 1H NMR (300 MHz, CDCl3) δ: 1.34 (t, 6H, J=7.0 Hz, CH3), 3.30 (dd, 1H, J=5.5 Hz, 12.0 Hz, H-5a), 3.42 (dd, 1H, J=6.0 Hz, 12.1 Hz, H-5b), 3.80 (m, 2H, CH2OH and 1H, OH), 4.05 (m, 1H, H-4) , 4.19 (m, 4H, CH2) , 4.35 (d, 1H, 2JHP =4.1 Hz, H-2).

Workup

waitat room temperature for 4.5 hrs
stirringthe solution was stirred for 15 min
customfollowed by evaporation of solvents
customThe crude material was purified by flash chromatography with a mixture of dichloromethane and methanol (95:5)

Sources & evidence

ORD record: ord-091340f044474edead9ae049ac6c895c
Source dataset: uspto-grants-1998_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05789394

Reaction notes

Loading…