Carbonothioic acid, O-(1-chloroethyl) S-ethyl ester → 1-{[(Ethylthio)carbonyl]oxy}ethyl 2-methylpropionate

To a solution of tetrabutylammonium isobutyrate (5) (382 mmol) in tetrahydrofuran (500 mL) was added compound (2) (49 g, 288 mmol). The mixture was stirred at ambient temperature for 16 h then the solvent removed in vacuo. The residue was dissolved in diethyl ether (600 mL), washed with water (3×300 mL) and the organic phase was separated, dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by vacuum distillation (60° C./240 mTorr) to afford the product (7) as a colorless liquid (40 g, 63%). 1H NMR (CDCl3, 400 MHz): δ 1.2 (d, 6H), 1.35 (t, 3H), 1.5 (d, 3H), 1.55 (m, 1H), 2.85 (dq, 2H), 6.95 (q, 1H).

1. customthe solvent removed in vacuo
2. dissolutionThe residue was dissolved in diethyl ether (600 mL)
3. washwashed with water (3×300 mL)
4. customthe organic phase was separated
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. distillationThe residue was purified by vacuum distillation (60° C./240 mTorr)

ORDレコード

ord-28d3cce3be494893a4b299149ed1ce0e

出典データセット

uspto-grants-2009_03

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07511158B2