Pyridine → 4-(Tetradecanoyloxy)methyl-4-vinyltetrahydro-2-furanone

A solution of 8b (0.2 g, 1.4 mmol) in CH2Cl2 (20 mL) was treated with pyridine (0.45 mL, 5.6 mmol), dimethylaminopyridine (0.034 g, 0.28 mmol), and tetradecanoyl chloride (0.76 mL, 2.8 mmol). After stirring for 2 h at room temperature, the reaction mixture was concentrated, and residue was purified by flash column chromatography over silica gel with hexane:EtOAc (3:1) as eluant to give 8c (0.49 g, 99%) as an oil: IR (neat) 1788 and 1741 cm-1 (C=O); 1H NMR (CDCl3) δ 0.86 (distorted t, 3 H, CH3), 1.25 (m, 20 H, CH3 (CH2)10CH2CH2CO), 1.60 (m, 2 H, CH3 (CH2)10CH2CH2CO), 2.31 (t, J=7.4 Hz, 2 H, CH3 (CH2)10CH2CH2CO), 2.60 (s, 2 H, H-3), 4.12 (AB q, J=11.3 Hz, 2 H, CH2OCOC13H27), 4.20 (AB q, J=9.3 Hz, 2 H, H-5), 5.19 (d, J=17.6 Hz, 1 H, CH=CHH), 5.28 (d, J=10.9 Hz, 1 H, CH=CHH), 5.84 (dd, J=10.9, 17.6 Hz, CH=CH2), 13C NMR (CDCl3) δ 14.02, 22.58, 24.69, 28.99, 29.11, 29.24, 29.34, 29.48, 29.53, 29.56, 31.81, 33.93, 36.57, 45.76, 66.63, 73.60, 116.63, 136.81, 173.27, 175.03. Anal. Calcd for C21H36O4 : C, 71.55; H: 10.30. Found. C, 71.46; H, 10.30.

1. concentrationthe reaction mixture was concentrated
2. customresidue was purified by flash column chromatography over silica gel with hexane:EtOAc (3:1) as eluant

ORD-Eintrag

ord-22e40f2cdadc4e5bb32d445033f2f5ba

Quelldatensatz

uspto-grants-1999_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05874464