Triethylamine → tert-Butyl thiomorpholine-4-carboxylate

tert-Butyl thiomorpholine-4-carboxylate (1.91 g, 9.42 mmol) was dissolved in dichloromethane (50 ml); m-chloroperbenzoic acid (5.0 g, 19 mmol) was gradually added while cooled with ice bath, stirred, and under nitrogen atmosphere; and the reaction mixture was stirred at room temperature for 12 hours. After addition of a saturated aqueous solution of sodium thiosulfate, the reaction mixture was kept stirred for a while; and this was subjected to extraction with ethyl acetate, washed with brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. Triethylamine (8.1 ml, 58 mmol) were added to the obtained crystals; and the reaction mixture was stirred at room temperature. tert-Butoxycarbonyl dicarbonate (13.3 ml, 58 mmol) was added thereto; and the reaction mixture was stirred at room temperature for 10 hours. The reaction mixture was concentrated under reduced pressure; and the obtained crystals were suspended with a solvent mixture of diethyl ether:ethanol=10:1, filtered off, washed with diethyl ether and dried under aeration to yield the title compound as colorless crystals (2.03 g, 8.63 mmol, 91.6%).

1. temperaturewhile cooled with ice bath
2. stirringand the reaction mixture was stirred at room temperature for 12 hours
3. stirringthe reaction mixture was kept stirred for a while
4. extractionand this was subjected to extraction with ethyl acetate
5. washwashed with brine
6. dry with materialdried over anhydrous sodium sulfate
7. concentrationconcentrated under reduced pressure
8. stirringand the reaction mixture was stirred at room temperature
9. stirringand the reaction mixture was stirred at room temperature for 10 hours
10. concentrationThe reaction mixture was concentrated under reduced pressure
11. additionand the obtained crystals were suspended with a solvent mixture of diethyl ether
12. filtrationethanol=10:1, filtered off
13. washwashed with diethyl ether
14. customdried under aeration

ORDレコード

ord-ca9ed8b2450f46f89d37934466d5ddf2

出典データセット

uspto-grants-2008_12

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07468380B2