6-fluoro-3,4-dihydro-2H-chromene-2-carbaldehyde

Conditions: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 234 ml of dimethyl sulfoxide was added 32 g of trimethyl sulfoxonium iodide. To it, potassium tertiary butoxide (16 g) was added and stirred for 1 h at 20-40° C. The reaction mixture was cooled and to it was added a solution of the compound obtained in Example 2 in dimethyl sulfoxide (26 ml.) while maintaining the temperature between 20°-40° C. for 1.5 hr. The reaction mixture was quenched in cold water. The aqueous layer was extracted with ethyl acetate, washed with water, concentrated under reduced pressure followed by product distillation to give 19.6 g of 6-fluoro-3,4-dihydro-2-oxiranyl-2H-1-benzopyran (VII) in the form of a mixture of A and B as an oil. The reaction mixture was cooled and to it while maintaining the temperature between 20°-40° C. for 1.5 hr The reaction mixture was quenched in cold water The aqueous layer was extracted with ethyl acetate washed with water concentrated under reduced pressure followed by product distillation

Conditions: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 234 ml of dimethyl sulfoxide was added 32 g of trimethyl sulfoxonium iodide. To it, potassium tertiary butoxide (16 g) was added and stirred for 1 h at 20-40° C. The reaction mixture was cooled and to it was added a solution of the compound obtained in Example 2 in dimethyl sulfoxide (26 ml.) while maintaining the temperature between 20°-40° C. for 1.5 hr. The reaction mixture was quenched in cold water. The aqueous layer was extracted with ethyl acetate, washed with water, concentrated under reduced pressure followed by product distillation to give 19.6 g of 6-fluoro-3,4-dihydro-2-oxiranyl-2H-1-benzopyran (VII) in the form of a mixture of A and B as an oil. The reaction mixture was cooled and to it while maintaining the temperature between 20°-40° C. for 1.5 hr The reaction mixture was quenched in cold water The aqueous layer was extracted with ethyl acetate washed with water concentrated under reduced pressure followed by product distillation

Conditions: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 234 ml of dimethyl sulfoxide was added 32 g of trimethyl sulfoxonium iodide. To it, potassium tertiary butoxide (16 g) was added and stirred for 1 h at 20-40° C. The reaction mixture was cooled and to it was added a solution of the compound obtained in Example 2 in dimethyl sulfoxide (26 ml.) while maintaining the temperature between 20°-40° C. for 1.5 hr. The reaction mixture was quenched in cold water. The aqueous layer was extracted with ethyl acetate, washed with water, concentrated under reduced pressure followed by product distillation to give 19.6 g of 6-fluoro-3,4-dihydro-2-oxiranyl-2H-1-benzopyran (VII) in the form of a mixture of A and B as an oil. The reaction mixture was cooled and to it while maintaining the temperature between 20°-40° C. for 1.5 hr The reaction mixture was quenched in cold water The aqueous layer was extracted with ethyl acetate washed with water concentrated under reduced pressure followed by product distillation