ethyl 4-chloro-5-methyl-1H-pyrazole-3-carboxylate → Ethyl 1-(4-(benzyloxycarbonyl)-2-(1,2,3,4-tetrahydroisoquinoline-2-carbonyl)phenyl)-4-chloro-5-methyl-1H-pyrazole-3-carboxylate

Beteiligte Stoffe

Reaktionsschritte

Following a procedure analogous to that for the synthesis of Intermediate 1E, ethyl 4-chloro-5-methyl-1H-pyrazole-3-carboxylate (Intermediate 1A, 509 mg, 2.70 mmol) and benzyl 4-fluoro-3-(1,2,3,4-tetrahydroisoquinoline-2-carbonyl)benzoate (1.00 g, 2.57 mmol) were converted to the title compound (690 mg, 48%). 1H NMR (CDCl3, 1.5:1 mixture of amide rotamers) δ 8.35-8.28 (m, 1H), 8.18 (t, J=1.9 Hz, 1H), 7.76 (d, J=8.4 Hz, 0.5H), 7.70 (d, J=8.4 Hz, 0.5H), 7.50-7.45 (m, 2H), 7.43-7.31 (m, 3H), 7.23-7.07 (m, 3.5H), 6.90 (d, J=7.9 Hz, 0.5H), 5.42 (s, 2H), 4.76-4.54 (m, 1H), 4.47 (s, 1H), 4.16 (q, J=7.0 Hz, 2.5H), 3.64 (br s, 1.5H), 3.13-3.02 (m, 0.5H), 2.81 (t, J=6.1 Hz, 1H), 2.34 (s, 2H), 2.26 (s, 1H), 1.21 (t, J=7.0 Hz, 1H), 1.12 (t, J=7.2 Hz, 2H); MS(ESI+) m/z 558.4 (M+H)+.

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