methyl 7-[2-((Z)-3-{pyrrolidin-1-yl}prop-1-enyl)-4-fluorobenzene-sulfonylamino]-4H-furo[2,3-c]chromene-6-carboxylate → methyl cis-(3aRS,9bRS)-7-[2-(3-{pyrrolidin-1-yl}propyl)-4-fluorobenzenesulfonylamino]-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate

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A solution of methyl 7-[2-((Z)-3-{pyrrolidin-1-yl}prop-1-enyl)-4-fluorobenzene-sulfonylamino]-4H-furo[2,3-c]chromene-6-carboxylate (Intermediate 15, 0.06 g) in IMS (4 mL) and formic acid (2 drops) was treated under an atmosphere of nitrogen with palladium hydroxide on carbon (10%, 0.02 g). The nitrogen was replaced by hydrogen and the mixture was stirred under an atmosphere of hydrogen for 1 hour. The mixture was filtered through Celite and the filtrate was evaporated to dryness to give methyl cis-(3aRS,9bRS)-7-[2-(3-{pyrrolidin-1-yl}propyl)-4-fluorobenzene-sulfonylamino]-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate (0.06 g) which was used without further characterisation.

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