Imidazole → 4-(iodomethyl)-2,2-dimethyl-1,3-dioxolane

Temperature

90 °C

To a solution of (2,2-dimethyl-1,3-dioxolan-4-yl)methanol (10 g, 75.67 mmol) in dry toluene (200 mL) was added triphenylphospine (23.82 g, 90.81 mmol), imidazole (15.45 g, 227 mmol), and iodine (24.97 g, 98.36 mmol). The mixture was stirred at 90° C. for 3 h. The solvent was then removed in vacuo and the residue was dissolved in DCM (200 mL) and washed with saturated Na2S2O3 solution water and brine. The organic layer was dried over MgSO4, filtered and concentrated in vacuo. The crude compound was purified on column of silica gel (DCM) to give the subject compound (15.79 g, yield 86%). Intermediate 12 was characterized by the following spectroscopic data: 1H NMR (CDCl3-d1, 300 MHz) δ (ppm) 4.33 (m, 1H), 4.19 (m, 1H), 3.82 (m, 1H), 3.32 (m, 1H), 3.27 (m, 1H), 1.49 (s, 3H), 1.38 (s, 3H).

1. customThe solvent was then removed in vacuo
2. dissolutionthe residue was dissolved in DCM (200 mL)
3. washwashed with saturated Na2S2O3 solution water and brine
4. dry with materialThe organic layer was dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe crude compound was purified on column of silica gel (DCM)

ORD record

ord-5c18ec685a2f414ebfcc59ab544f6bf7

Source dataset

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09295732B2