Ethyl propiolate → HCID 54535752, compound

Participants

Reaction Steps

To a mixture of 1-[4-(4-fluoro-phenoxy)-benzenesulfonylamino]-cyclopentanecarboxylic acid tert-butyl ester (1.0 g, 2.3 mmole) in 10 mL THF and 2.3 mL (2.3 mmole) 1M tetrabutylammonium fluoride in THF was added 0.23 mL (2.3 mmole) ethyl propiolate at ambient temperature. After stirring 1 hour the reaction was complete by HPLC and was stripped to dryness in vacuo. The residue was dissolved in 20 mL ethyl acetate and washed with 2×10 mL water and the organic solution stripped to an oil. This oil was chromatographed over silica gel, eluting with 10% ethyl acetate/hexane to yield 0.95 g (77% yield) 1-{(2-ethoxycarbonyl-vinyl)-[4-(4-fluoro-phenoxy)-benzenesulfonyl]-amino}-cyclopentanecarboxylic acid tert-butyl ester as a colorless oil. 1H NMR (CDCl3) indicated a 1.5:1 trans/cis ratio.

Provenance & Evidence