Reaktion #6553

Reaktionsgleichung

2-nitrobenzenesulfonyl chloride

(4R cis)-1,1-dimethylethyl 6-hydroxymethyl-2,2-dimethyl -1,3-dioxane-4-acetate

triethylamine

water

2-nitrobenzenesulfonyl chloride

→

product

Ausbeute 122.9%

(4R-cis) 1,1-dimethylethyl 6-(2-nitrobenzenesulfonyloxymethyl)-2,2-dimethyl-1,3-dioxane-4-acetate

Ausbeute 122.9%

Lösungsmittel

methylene chloride

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGthe solution stirred for a further 4 hours
2. 2
   Sonstigethe layers separated
3. 3
   ExtraktionThe upper aqueous layer is extracted with 250 mL of methylene chloride
4. 4
   Waschenthe combined organic layers are washed with 100 mL each of saturated sodium bicarbonate solution
5. 5
   Sonstigeremoval of 2-nitrobenzenesulfonyl chloride
6. 6
   SonstigeDrying the solution
7. 7
   Einengenwith magnesium sulfate and concentration in vacuo

Vorschrift

To a stirring 20°-25° C. solution of the (4R cis)-1,1-dimethylethyl 6-hydroxymethyl-2,2-dimethyl -1,3-dioxane-4-acetate (European Patent Application 0319,847) (10 g, 0.038 mol) in methylene chloride (250 mL) containing triethylamine (7 mL, 0.05 mol) is added 2-nitrobenzenesulfonyl chloride (9.8 g, 0.043 mol). Stirring is continued at 20°-25° C. for 24 hours, a further portion of 2-nitrobenzenesulfonyl chloride (2.0 g, 0.009 mol) is added and the solution stirred for a further 4 hours. The solution is then poured onto 200 mL of water and the layers separated. The upper aqueous layer is extracted with 250 mL of methylene chloride and the combined organic layers are washed with 100 mL each of saturated sodium bicarbonate solution to ensure complete removal of 2-nitrobenzenesulfonyl chloride and then saturated sodium chloride. Drying the solution with magnesium sulfate and concentration in vacuo gives 20.8 g of the product as a green oil.

Quelle