N,N,N',N'-Tetramethylethylenediamine → 6-(tert-butyl)-2-methyl-8H-indeno[2,1-b]thiophen-8-one

Participants

Reaction Conditions

Reaction Steps

A solution of 2.23 g (0.01 mol) of 4-[4-(tert-butyl)phenyl]-2-methylthiophene, 2.97 mL (0.02 mol) of TMEDA in 30 mL of ether was treated with 13 mL (0.02 mol) of 1.6M BuLi in hexane under stirring at −40° C. Then the reaction mixture was allowed to warm up to r.t. and stirred for 3 h. The reaction mixture was cooled −40° C. and treated with 1.17 g (0.01 mol) of ethyl N,N-dimethylcarbamate in 10 mL of ether. Then the reaction mixture was allowed to warm up to r.t. and was stirred overnight. Resulting mixture was treated with 10% aqueous NH4Cl, organic layer was separated, washed with 10% aqueous NH4Cl and then dried over anhydrous Na2SO4. Solvent was evaporated, the residue was washed with methanol. Yield 2.4 g (about 100%) of red oil.

Provenance & Evidence