Trifluoroacetic acid → (S)-3-(3,6-dihydro-2H-pyran-4-yl)-7-(2-fluoropyridin-3-yl)-5'H-spiro[chromeno[2,3-b]pyridine-5,4'-thiazol]-2'-amine

Participants

Reaction Conditions

Reaction Steps

A RBF was charged with tert-butyl 3-(3,6-dihydro-2H-pyran-4-yl)-7-(2-fluoropyridin-3-yl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-thiazole]-2′-ylcarbamate (0.091 g, 0.166 mmol). The material was dissolved in 0.5 mL of CH2Cl2 and TFA (0.149 mL, 1.932 mmol) was added. The reaction was heated to 50° C. and stirred for one hour. The reaction was concentrated, diluted with CH2Cl2 and washed with saturated sodium bicarbonate solution. The aqueous layer was extracted with CH2Cl2, and the combined organic layers were washed with brine, dried with sodium sulfate, filtered, and concentrated to afford (S)-3-(3,6-dihydro-2H-pyran-4-yl)-7-(2-fluoropyridin-3-yl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-thiazol]-2′-amine as an off-white solid. MS m/z=447.3 [M+H]+. Calculated for C24H19FN4O2S: 446.12.

Provenance & Evidence