D-Proline → (S)-dibenzyl 1-(1-hydroxy-3-(tetrahydro-2H-pyran-4-yl)propan-2-yl)hydrazine-1,2-dicarboxylate

温度

0 °C

To a stirred solution of 3-(tetrahydro-pyran-4-yl)-propionaldehyde (8.59 g, 0.06 mol) and dibenzyl azodicarboxylate (12.8 g, 0.042 mol) in MeCN (250 mL) at 0° C. was added (R-proline) (0.48 g, 0.0042 mol). After stirring the mixture at 0° C. for 15 h, ethanol (100 mL) and NaBH4 (1.56 g, 0.042 mol) were added, and the mixture was stirred at 0° C. for 40 min. The reaction was quenched by slow addition of 10% aq citric acid (15 mL), and the whole solution was concentrated in vacuo. This residue was diluted with EtOAc (200 mL), washed with brine (50 mL), dried over Na2SO4, and concentrated in vacuo to give crude product which was purified by column chromatography to give (S)-dibenzyl 1-(1-hydroxy-3-(tetrahydro-2H-pyran-4-yl)propan-2-yl)hydrazine-1,2-dicarboxylate (16.52 g, 89%). 1H NMR (CD3OD) δ 1.0-1.5 (m, 8H), 2.9-3.3 (m, 2H), 3.4-3.6 (m, 2H), 3.7-3.9 (m, 2H), 4.4-4.7 (m, 2H), 5.1-5.4 (m, 4H), 7.2-7.4 (m, 10H).

1. stirringthe mixture was stirred at 0° C. for 40 min
2. customThe reaction was quenched by slow addition of 10% aq citric acid (15 mL)
3. concentrationthe whole solution was concentrated in vacuo
4. additionThis residue was diluted with EtOAc (200 mL)
5. washwashed with brine (50 mL)
6. dry with materialdried over Na2SO4
7. concentrationconcentrated in vacuo
8. customto give crude product which
9. customwas purified by column chromatography

ORDレコード

ord-e081292ec63447d6af8e1dcf1288bce3

出典データセット

uspto-grants-2011_01

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07872028B2