2-bromo-4,4-dimethyl-3-oxopentanenitrile

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pivaloylacetonitrile (1.00 g, 7.99 mmol) was dissolved in carbon tetrachloride (15 mL). N-Bromosuccinimide (1.42 g, 7.99 mmol) was added, and the mixture was refluxed for 15 minutes. After cooling, the insoluble matter was filtered off, and the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1) to give the title compound (1.43 g, 87.9%) as a yellowish brown oil. the mixture was refluxed for 15 minutes After cooling the insoluble matter was filtered off the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1)

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Using α-bromo-pivaloylacetonitrile and thiourea as the raw materials, the same operation as the Example 181(1) gave the title compound.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pivaloylacetonitrile (1.00 g, 7.99 mmol) was dissolved in carbon tetrachloride (15 mL). N-Bromosuccinimide (1.42 g, 7.99 mmol) was added, and the mixture was refluxed for 15 minutes. After cooling, the insoluble matter was filtered off, and the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1) to give the title compound (1.43 g, 87.9%) as an yellowish brown oil. the mixture was refluxed for 15 minutes After cooling the insoluble matter was filtered off the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pivaloylacetonitrile (1.00 g, 7.99 mmol) was dissolved in carbon tetrachloride (15 mL). N-Bromosuccinimide (1.42 g, 7.99 mmol) was added, and the mixture was refluxed for 15 minutes. After cooling, the insoluble matter was filtered off, and the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1) to give the title compound (1.43 g, 87.9%) as a yellowish brown oil. the mixture was refluxed for 15 minutes After cooling the insoluble matter was filtered off the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pivaloylacetonitrile (1.00 g, 7.99 mmol) was dissolved in carbon tetrachloride (15 mL). N-Bromosuccinimide (1.42 g, 7.99 mmol) was added, and the mixture was refluxed for 15 minutes. After cooling, the insoluble matter was filtered off, and the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1) to give the title compound (1.43 g, 87.9%) as a yellowish brown oil. the mixture was refluxed for 15 minutes After cooling the insoluble matter was filtered off the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Using α-bromo-pivaloylacetonitrile and thiourea as the raw materials, the same operation as the Example 181(1) gave the title compound.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pivaloylacetonitrile (1.00 g, 7.99 mmol) was dissolved in carbon tetrachloride (15 mL). N-Bromosuccinimide (1.42 g, 7.99 mmol) was added, and the mixture was refluxed for 15 minutes. After cooling, the insoluble matter was filtered off, and the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1) to give the title compound (1.43 g, 87.9%) as an yellowish brown oil. the mixture was refluxed for 15 minutes After cooling the insoluble matter was filtered off the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pivaloylacetonitrile (1.00 g, 7.99 mmol) was dissolved in carbon tetrachloride (15 mL). N-Bromosuccinimide (1.42 g, 7.99 mmol) was added, and the mixture was refluxed for 15 minutes. After cooling, the insoluble matter was filtered off, and the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1) to give the title compound (1.43 g, 87.9%) as a yellowish brown oil. the mixture was refluxed for 15 minutes After cooling the insoluble matter was filtered off the residue obtained by evaporation of the filtrate under reduced pressure was purified by chromatography on silica gel (n-hexane:ethyl acetate=4:1)