Imidazole → 3-(Iodomethyl)-1,1-dimethoxycyclobutane

Temperature

0 °C

In a round bottom flask was placed triphenylphosphine (2.42 g, 9.25 mmol) and imidazole (1.26 g, 18.49 mmol) in methylene chloride (20 ml) and it was cooled to 0° C. in an ice bath. To this cooled solution was added iodine (2.35 g, 9.25 mmol). Once the iodine dissolved a solution of (3,3-dimethoxy-cyclobutyl)-methanol (1.04 g, 7.11 mmol) in methylene chloride (10 ml) was added. The reaction was stirred at 0° C. for 30 min and then at 25° C. for 2 h. After this time the reaction was poured into ice cold water (50 ml) and extracted with methylene chloride (2×30 ml). The combined organic layers were washed with 1.0 N sodium thiosulfate (50 ml), dried over sodium sulfate, filtered and concentrated in vacuo. Flash column chromatography (Merck Silica gel 60, 230-400 mesh, 30% ethyl acetate/hexanes to 40% ethyl acetate/hexanes) afforded 3-iodomethyl-1,1-dimethoxy-cyclobutane (1.34 g, 74%) as a light yellow oil: 1H NMR (300 MHz, CDCl3) δ ppm 1.72-1.81 (m, 2H, CH2), 2.28-2.53 (m, 3H, CH2 and CH), 3.14 (s, 3H, OCH3), 3.16 (s, 3H, OCH3), 3.29 (d, J=7.7 Hz, 2H, ICH2).

1. customIn a round bottom flask was placed
2. additionwas added
3. waitat 25° C. for 2 h
4. extractionextracted with methylene chloride (2×30 ml)
5. washThe combined organic layers were washed with 1.0 N sodium thiosulfate (50 ml)
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo

ORD record

ord-63e8c03106cc4f8b8e28247e29e4d308

Source dataset

uspto-grants-2011_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07935699B2