Diisopropylethylamine → (E)-methyl 3-(4-((1R,3R)-2-((S)-3-fluoro-2-methylpropyl)-3-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)phenyl)acrylate

Participants

Reaction Conditions

Reaction Steps

(S)-3-Fluoro-2-methylpropyl trifluoromethanesulfonate (obtained as described in Example 3, preparation of starting materials) (291 mg, 1.30 mmol) was added to a solution of (E)-methyl 3-(4-((1R,3R)-3-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)phenyl)acrylate (300 mg, 0.87 mmol) and N,N-diisopropylethylamine (0.226 ml, 1.30 mmol) in 1,4-dioxane (5 ml). The mixture was stirred at 90° C. for 1 hour then the mixture was evaporated to dryness and the residue was partitioned between DCM (30 nil) and water (30 ml). The aqueous layer was extracted with DCM (30 ml) and the extracts combined with the organic layer. The combined extracts were filtered through a phase-separating paper and evaporated. The residue was purified by flash silica chromatography, elution solvent 15% EtOAc in heptane. Pure fractions were evaporated to dryness to afford (E)-methyl 3-(4-((1R,3R)-2-((S)-3-fluoro-2-methylpropyl)-3-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)phenyl)acrylate (314 mg, 86%) as an off-white solid. 1H NMR (400 MHz, DMSO, 30° C.) δ 0.87 (3H, d), 1.06 (3H, d), 1.9-2.28 (2H, m), 2.55-2.8 (3H, m), 2.97-3.21 (1H, m), 3.72 (3H, s), 4.31-4.69 (2H, m), 4.88 (1H, s), 6.60 (1H, dd), 6.98 (1H, t), 7.04 (1H, t), 7.17-7.35 (3H, m), 7.44 (1H, d), 7.55-7.76 (3H, m), 10.65 (1H, s). m/z: ES+ [M+H]+ 421.

Provenance & Evidence