2-(Ethanesulfonyl)-1,3-benzothiazole → HCID 68710339, compound

Participants

Reaction Conditions

Reaction Steps

To a stirring solution of Boc-D-Prolinal (0.53 g, 2.65 mmol) and 2-(ethyl sulfonyl)-1,3-benzothiazole (1.5 g, 6.62 mmol) in tetrahydrofuran (4 mL) at −78° C. was added 1M Lithium bis(trimethylsilyl)amide in THF (4 mL) and continued stirring for 30 min. Then the mixture was warmed to 0° C. and stirred for an additional 3 hr. Upon completion via LC-MS, the reaction mixture was quenched with 20% ammonium chloride solution and extracted with ethyl ether. The ether layer washed with brine, dried over sodium sulfate anhydrous, filtered and dried in vacuo to yield crude product which was further purified on an ISCO normal phase HPLC using a 100% to 75% gradient of hexane to ethyl acetate as mobile phase. Pure tert-butyl-(2R)-2-[(1E)-prop-1-enyl]pyrrolidine-1-carboxylate was isolated from the combined fractions (0.09 g). 1H NMR (CD3OD, 400 Mhz) 5.51-5.44 ppm (m, 1H), 5.39-5.31 (m, 1H), 4.20-4.12 (m, 1H), 3.38-3.30 (m, 3H), 1.91-1.81 (m, 2H), 1.79-1.66 (m, 4H), 1.425 (s, 9H).

Provenance & Evidence