Tert-butyl thieno[2,3-b]pyrazin-6-ylcarbamate → Thieno[2,3-b]pyrazin-6-amine

Participants

Reaction Steps

A red solution of tert-butyl thieno[2,3-b]pyrazin-6-ylcarbamate (5.09 mmol, 1.28 g) in 66% TFA in CH2Cl2 25 mL was stirred overnight at room temperature The reaction mixture was concentrated in vacuo, dissolved in ethyl acetate, washed with NaHCO3 solution, brine, dried and evaporated to give thieno[2,3-b]pyrazin-6-amine 106 (620 mg, 81%). NMR (400 MHz, DMSO-d6) 5.98 (s, 1H), 7.17 (br s, 2H), 7.93 (d, J=2.7 Hz, 1H), 8.20 (d, J=2.7 Hz, 1H).

Provenance & Evidence