反应详情

Add 10% palladium on carbon (water wet, 20 g) slurried in EA (100 mL) to a sealed pressure reactor via vacuum transfer. Rinse transfer line with a minimal amount of EA. Charge (E)-tert-butyl 2-(4-methoxybenzylidene)hydrazinecarboxylate (320 g, 1.28 mol) dissolved in tetrahydrofuran (THF, 1000 mL) via vacuum transfer and rinse line with a minimal amount of THF. Pressurize the reactor to 50 PSI with H2 and mix the contents of the reactor at 20±10° C. Continue the reaction, maintaining the hydrogen pressure at 50 PSI, until no further hydrogen uptake is observed. Filter the reaction solution to remove the catalyst and wash the catalyst filter-cake with THF (500 mL). Add the wash to the reaction filtrate. Concentrate the solution in vacuo to obtain the title compound (337 g, 86%) as an oil. 1H NMR (400 MHz, DMSO-d6) δ 8.1-8.3 (s, 1H), 7.1-7.3 (d, 2H), 6.8-6.9 (d, 2H), 4.4-4.6 (bs, 1H), 3.7-3.8 (s, 2H), 3.6-3.7 (s, 3H), 1.3-1.5 (s, 9H).

1. washRinse transfer line with a minimal amount of EA
2. washrinse line with a minimal amount of THF
3. additionmix the contents of the reactor at 20±10° C
4. customthe reaction
5. filtrationFilter the reaction solution
6. customto remove the catalyst
7. washwash the catalyst
8. filtrationfilter-cake with THF (500 mL)
9. additionAdd the
10. washwash to the reaction filtrate
11. concentrationConcentrate the solution in vacuo