Triethylamine → Benzyl(3S,4S)-3-[(tert-butoxycarbonyl)amino]-4-{[(methylsulfonyl)oxy]methyl}-1-pyrrolidinecarboxylate

The product of Example 7G (43.7 g, 125 mmol) and triethylamine (25.2 g, 250 mmol) in CH2Cl2 (600 mL) were treated with methanesulfonyl chloride (12.6 mL, 163 mmol) over 30 minutes at −10° C. The solution was allowed to warm to ambient temperature over 1 hour and was monitored by HPLC. When the reaction was completed, it was quenched with water (100 mL). The layers were separated and the aqueous phase was extracted with CH2Cl2 (2×400 mL). The combined organic phases were washed with brine (2×100 mL), dried over Na2SO4, filtered and the filtrate concentrated under reduced pressure to provide the title compound as a brown oil (52.0 g, 0.12 mol, 97% yield). 1H NMR (CDCl3, 300 MHz) δ 1.46 (s, 9H), 2.80 (m, 1H), 3.08 (s, 3H), 3.40 (m, 2H), 3.70 (m, 2H), 4.10 (m, 1H), 4.40 (m, 2H), 4.75 (m, 1H), 5.16 (s, 2H), 7.30 m, 5H); MS (DCl/NH3) m/z 446 (M+NH4)+, 429 (M+H)+. HPLC conditions: HPLC conditions: Zorbax-XDB-C8 column 4.6×250 mm with solvents H2O (0.2 v. % HClO4)/MeCN (from v.80:20 to 10:90 within 15 min.) at 1.0 mL/Min., UV detection @220 nm. 20/80, flow rate, 1.0 mL/min; uv 220 nm; tR=13.1 minutes.

1. customit was quenched with water (100 mL)
2. customThe layers were separated
3. extractionthe aqueous phase was extracted with CH2Cl2 (2×400 mL)
4. washThe combined organic phases were washed with brine (2×100 mL)
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationthe filtrate concentrated under reduced pressure

ORDレコード

ord-4f0190e453a34f1f89610ed1a28a4fc5

出典データセット

uspto-grants-2011_01

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07872010B2