Sodium Bicarbonate → 2-(2-Methoxyphenyl)-5,6,7,8-tetrahydro-8-(2-((triphenylmethyl)thio)ethyl)-imidazo[1,2-a]pyrazine

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반응 단계

The product from Step 13.f. (2.50 g, 3.96 mmol) was dissolved in CH2Cl2 (16.0 ml) and treated with Tfa (4.0 ml) at room temperature under N2 for about 3.5 hours. The reaction was then poured cautiously into a saturated NaHCO3 solution (150 ml) and the product was extracted with CH2Cl2 (2×50 ml), dried over Na2SO4, filtered and concentrated under reduced pressure. The crude product was purified by flash chromatography on silica gel using 9:1/hexanes:EtOAc and then 100% EtOAc as eluants. Product fractions were combined and concentrated under reduced pressure to obtain a white foam (1.35 g, 64%) which was used without further purification. Mass spec. 532.4 MH+.

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