Cesium carbonate → 5-(3,3-Dimethyl-but-1-ynyl)-3-(1,4-dioxa-spiro[4.5]dec-8-ylamino)-thiophene-2-carboxylic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-(3,3-dimethyl-but-1-ynyl)-3-iodo-thiophene-2-carboxylic acid methyl ester (0.5 g, 1.5 mmol), palladium acetate (0.033 g, 0.15 mmol), BINAP (0.093 g, 0.15 mmol), cesium carbonate (0.733 g, 2.25 mmol) and 1,4-Dioxa-spiro[4.5]dec-8-ylamine (0.706 g, 4.5 mmol) in toluene (8 mL) was degassed with N2 then heated to 110° C. for 8 h. The reaction was diluted with ethyl acetate filtered through a Celite pad and purified by silica gel chromatography (0-40% hexane/ethylacetate) to give the title compound in 50% yield. MS (m/z): 378.1 [M+H]; HPLC retention time: 5.12 min (2-98% acetonitrile:water with 0.05% trifluoroacetic acid).

Provenance & Evidence