Diethyl Ether → HCID 70155743, compound

Participants

Reaction Steps

To a solution of 2.0 gm (4.8 mMol) 6-carboxy-3-(dimethyl)amino-6-carboxy-9-triisopropylsilyl-1,2,3,4-tetrahydro-9H-carbazole in 100 mL diethyl ether at 0° C. were added 8 mL (9.6 mMol) methyllithium (1.2 M in diethyl ether) over a 15 minute period. After an hour an additional 0.4 mL of the methyllithium solution were added. 0.4 mL additions were continued until all of the starting material had reacted. The reaction mixture was then allowed to warm to room temperature and to it was first added ice and then the reaction mixture was diluted with 100 mL of water. The mixture was shaken and the phases separated. The aqueous phase was twice extracted with 100 mL aliquots of fresh diethyl ether. All of the organic extracts were combined, washed with saturated aqueous sodium chloride and concentrated under reduced pressure. The residue was subjected to florisil chromatography, eluting sequentially with toluene, 9:1 toluene:ethyl acetate, 4:1 toluene:ethyl acetate, 1:1 toluene:ethyl acetate, and ethyl acetate. Fractions containing product were combined and concentrated under reduced pressure to give 1.37 gm (69%) of the desired product as a solid.

Provenance & Evidence