반응 #2072904

반응 방정식

(tert-butyldimethylsilyloxy) acetaldehyde

(4R,9aR)-6-bromo-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester

tert-butyllithium

→

(4R,9aR)-6-[2-(tert-butyl-dimethyl-silanyloxy)-1-hydroxy-ethyl]-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester

수율 46.5%

용매

pentane

toluene

반응 조건

후처리

1. 1
   workup.STIRRINGthe mixture was stirred at −78° C. for 30 min
2. 2
   기타The reaction was quenched by addition of 10% aqueous ammonium chloride
3. 3
   기타The phases were separated
4. 4
   기타the organic phase was purified by chromatography on silica gel with heptane

실험 절차

To a solution of 4.00 g (4R,9aR)-6-bromo-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester in 100 ml toluene was added drop wise at −78° C. 10.86 ml of a 1.5M solution of tert-butyllithium in pentane. The mixture was stirred at this temperature for 30 min. To the resulting solution was added 5.017 g (tert-butyldimethylsilyloxy) acetaldehyde and the mixture was stirred at −78° C. for 30 min. The reaction was quenched by addition of 10% aqueous ammonium chloride. The phases were separated and the organic phase was purified by chromatography on silica gel with heptane:ethyl acetate=4:1 to yield 2.34 g (4R,9aR)-6-[2-(tert-butyl-dimethyl-silanyloxy)-1-hydroxy-ethyl]-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester as slightly yellow oil (MS: 464.4 (M+H+))

출처