Piperidine → Methyl 3-[(2-methoxy-2-oxoethyl)thio]butanoate

Reaction equation

[C:1]([O:5][CH3:6])(=[O:4])[CH2:2][SH:3].N1CCCCC1.[C:13]([O:18][CH3:19])(=[O:17])/[CH:14]=[CH:15]/[CH3:16]>>[CH3:6][O:5][C:1](=[O:4])[CH2:2][S:3][CH:15]([CH3:16])[CH2:14][C:13]([O:18][CH3:19])=[O:17]

Participants

Reactant 3

HCID 8082Piperidine2×

HCID 16907Methyl Thioglycolate

HCID 638132Methyl Crotonate

Product 1

HCID 2777633Methyl 3-[(2-methoxy-2-oxoethyl)thio]butanoateYield 89%

Procedure

To a mixture of methyl thioglycolate (45 mL, 503.2 mmol) and piperidine (0.8 mL) at 0° C. was slowly added methyl crotonate (67 mL, 631.7 mmol). Additional piperidine (0.8 mL) was added in two portions after ten and twenty minutes. After stirring for 15 hours, the mixture was purified by vacuum distillation. The fraction was collected at 110-112° C. to give methyl 3-(2-methoxy-2-oxoethylthio)butanoate (92 g, 89%). 1H NMR (CDCl3, 400 MHz) δ 3.75 (s, 3H), 3.70 (s, 3H), 3.38-3.44 (m, 3H), 2.71-2.46 (m, 2H), 1.36 (d, J=6.8 Hz, 3H).