Binap, (A+-)- → HCID 67278909, compound

Participants

Reaction Conditions

Reaction Steps

Nitrogen was bubbled through a mixture of 2-triisopropylsilanyloxy-1-triisopropylsilanyloxymethyl-ethylamine (prepared from serinol using triisopropylsilyl chloride) (420 mg, 1.04 mmol) and 3-bromo-5-(4,4-dimethyl-cyclohex-1-enyl)-thiophene-2-carboxylic acid methyl ester (350 mg, 1.06 mmol) in dioxane (3.5 mL) containing CS2CO3 (1 g, 3.07 mmol) and Pd2(dba)3 (96 mg, 0.1 mmol) for 6 min. 2,2′-Bis(diphenylphosphino)-1,1′-binaphthyl (105 mg, 0.17 mmol) was added and the mixture was stirred at 80° C. for 24 h. It was diluted with DCM, filtered through celite and evaporated. 5-(4,4-Dimethyl-cyclohex-1-enyl)-3-(2-triisopropylsilanyloxy-1-triisopropylsilanyloxymethyl-ethylamino)-thiophene-2-carboxylic acid methyl ester was obtained by chromatography over silica gel (hexane:EtOAc—95:5) (500 mg, 72%).

Provenance & Evidence