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

反応式

[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]

参加物

反応物 3

HCID 8082Piperidine2 回

HCID 16907Methyl Thioglycolate

HCID 638132Methyl Crotonate

生成物 1

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

実験手順

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).