N-[3-(4,4'-dimethoxytrityloxymethyl)benzyl]-N'-{[6-(tert-butyldimethylsilyloxymethyl)pyridin-2-yl]methyl}thiourea → N-[3-(4,4'-dimethoxytrityloxymethyl)benzyl]-N'-[(6-hydroxymethylpyridin-2-yl)methyl]thiourea

Participants

Reaction Steps

N-[3-(4,4′-Dimethoxytrityloxymethyl)benzyl]-N′-{[6-(tert-butyldimethylsilyloxymethyl)pyridin-2-yl]methyl}thiourea (22) (316 mg, 0.43 mmol) was suspended in THF (2.2 mL). The air was evacuated from the reaction system, and then Ar was charged therein. The suspension was stirred at a room temperature. To the suspension was added 1.0M TBAF in THF (0.48 mL). The mixture was further stirred for 12 hours. TLC was used to confirm there was no starting material in the mixture. Then, the reaction mixture was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (CDCl3:MeOH=200:1 to 50:1) to give N-[3-(4,4′-dimethoxytrityloxymethyl)benzyl]-N′-[(6-hydroxymethylpyridin-2-yl)methyl]thiourea (13) (141 mg, 54%) as yellow crystals.

Provenance & Evidence