Ethyl chloroformate → 1-(4-tert-butyldiphenylsilyloxymethylphenyl)-4-ethoxycarbonyl-2-(1-trityl-1H-tetrazol-5-yl)pyrrole

To a stirred solution of 4-bromo-1-(4-tert-butyldiphenylsilyloxymethylphenyl)-2-(1-trityl-1H-tetrazol-5-yl)pyrrole (500 mg) in a mixture of tetrahydrofuran (5 ml) and N,N,N',N'-tetramethylethylenediamine (0.19 ml) was added n-butyl lithium (0.41 ml; 1.6M in n-hexane) at --78° C. under nitrogen atmosphere and the mixture was stirred at the same temperature for half an hour. Ethyl chloroformate (0.3 ml) was added to the mixture at the same temperature and the resulting mixture was stirred at -78° C. for half an hour, at 0° C. for one hour and then at ambient temperature for two hours. The reaction was quenched with aqueous saturated sodium bicarbonate and diluted with ethyl acetate. The organic layer was washed with brine and dried over magnesium sulfate. After filtration, the filtrate was concentrated and the residue was purified by flash chromatography eluted with a mixture of ethyl acetate--n-hexane 1:9 (V/V) to give 1-(4-tert-butyldiphenylsilyloxymethylphenyl)-4-ethoxycarbonyl-2-(1-trityl-1H-tetrazol-5-yl)pyrrole (311 mg) as a colorless viscous oil.

1. stirringthe resulting mixture was stirred at -78° C. for half an hour, at 0° C. for one hour
2. customThe reaction was quenched with aqueous saturated sodium bicarbonate
3. additiondiluted with ethyl acetate
4. washThe organic layer was washed with brine
5. dry with materialdried over magnesium sulfate
6. filtrationAfter filtration
7. concentrationthe filtrate was concentrated
8. customthe residue was purified by flash chromatography
9. washeluted with a mixture of ethyl acetate--n-hexane 1:9 (V/V)

ORD-Eintrag

ord-e817a5eccd554d34b6f0796a94974017

Quelldatensatz

uspto-grants-1993_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05210092