反应详情

Into a 3-neck, 300 mL round bottom flask was charged 2.0g (0.05 mole, 2.5 equivalents (eq)) of 60% NaH, which had been previously washed two times with successive 30 mL portions of hexane, in 50 mL of DMF. While stirring under nitrogen, 5.98 g (0.020 mole, 1.0 eq) of 4-(4-chlorophenyl)-2-(t-butylsulfonyl)butanenitrile in 50 mL of DMF was added dropwise over 0.5 hr. The mixture was stirred for an additional 45 minutes after which 1-(chloromethyl)-1,2,4-triazole hydrochloride (3.36 g, 0.022 mole), was added directly in two portions. The mixture was stirred at room temperature for 12 hrs, 40 ° C. for 8 hrs and 45 ° C. for 12 hrs after which analysis by GLC indicated the reaction was complete. The reaction was quenched by the addition of water and extracted with 150 mL of ethyl acetate, dried with sodium sulfate, filtered and concentrated to give 10 g of crude product. The product was purified by column chromatography on silica gel. Elution with hexane:ethyl acetate (2:1) gave 3.6 g of an oil (fractions 1-5) which was followed by elution with hexane:ethyl acetate (1:1) to give an additional 1.0 g of oil. Both fractions contained a major and minor product as observed using thin layer chromatography (TLC) in ethyl acetate:hexane (1:1). The 3.6 grams of oil was further purified by flash chromatography on silica gel with hexane:ethyl acetate (1:1). The product was collected in fractions 34-60 (20 mL fractions) and gave 1.4 g of a thick yellow oil.

1. washhad been previously washed two times with successive 30 mL portions of hexane
2. additionwas added directly in two portions
3. stirringThe mixture was stirred at room temperature for 12 hrs, 40 ° C. for 8 hrs and 45 ° C. for 12 hrs after which analysis by GLC
4. customThe reaction was quenched by the addition of water
5. extractionextracted with 150 mL of ethyl acetate
6. dry with materialdried with sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated
9. customto give 10 g of crude product
10. customThe product was purified by column chromatography on silica gel
11. washElution with hexane:ethyl acetate (2:1)