Lithium Hydroxide → cis-(3aRS,9bRS)-7-[2-((Z)-3-diethylaminoprop-1-enyl)-4-fluorobenzenesulfonylamino]-1,2,3a,4,5,9b-hexahydrofuro[2,3-c]quinoline-6-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

Lithium hydroxide (0.09 g) was added to a solution of methyl cis-(3aRS,9bRS)-5-acetyl-7-[2-((Z)-3-diethylaminoprop-1-enyl)-4-fluorobenzenesulfonylamino]-1,2,3a,4,5,9b-hexahydrofuro[2,3-c]quinoline-6-carboxylate (Intermediate 27, 0.06 g) in a mixture of dioxane (5 mL) and water (1 mL) and the mixture was stirred and heated at 80° C. overnight. The mixture was then irradiated in the microwave at 150° C. for 30 minutes and then at 180° C. for 30 minutes. After cooling, the mixture was filtered and the filtrate was acidified by addition of formic acid (1 mL) and then evaporated to dryness. The residue was purified by preparative HPLC (C18) eluting with a mixture of acetonitrile and water, containing 0.1% formic acid, with a gradient of 10-98%. The isolated product was dissolved in DCM and evaporated to dryness then dissolved in ether and evaporated to dryness to give cis-(3aRS,9bRS)-7-[2-((Z)-3-diethylaminoprop-1-enyl)-4-fluorobenzenesulfonylamino]-1,2,3a,4,5,9b-hexahydrofuro[2,3-c]quinoline-6-carboxylic acid (0.005 g) as a white solid.

Provenance & Evidence