Isobutyl chloride → HCID 69311330, compound

Participants

Reaction Steps

To a solution of (3S)-3-isopropyl-1,3-dihydro-isobenzofuran-1-ol (14.11 g, 0.129 mol) in THF (250 ml) was added at reflux temperature through a Teflon tube, which ended under the surface in the reaction mixture, a solution of isobutyl magnesium chloride (freshly prepared from 0.387 mol isobutyl chloride and 0.58 mol magnesium in 250 ml of THF) slowly within 20 minutes under efficient stirring. The mixture was then quenched with a solution of ammonium chloride (10%). The organic layer was separated, and the solvent was removed on the rotavapor. The residue was re-dissolved in ethyl acetate (200 ml), and this solution was washed with water (150 ml) and brine (150 ml). After drying and removal of the solvent the product was obtained as a yellow oil (31.5 g). 1H/13C-NMR (300 MHz, CDCl3, HSQC/HMBC) δ/δ 0.78 (d, J=6.9 Hz)/19.00, 1.04 (d, J=6.5 Hz)/20.22 (2 i-Pr CH3); 0.95 (d, J=6.5 Hz)/23.87, 0.96 (d, J=6.5 Hz)/22.32 (2 i-Bu CH3); 1.80 (m)/25.33 (i-Bu CHMe2); 2.02 (m)/35.13 ((i-Pr CHMe2); 1.47/1.72 (m)/48.03 (CH2); 3.09 (br s, 2 OH); 4.53 (d, J=8.1 Hz)/77.55 (CH(OH)i-Pr); 5.08 (dd, J=4.7 Hz, J=9.5 Hz)/68.87 (CH(OH)i-Bu); 7.40 (m)/126.44 (Ar i-Bu ortho-CH); 7.21 (m)/127.37 (Ar meta-CH); 7.28 (m)/127.55 (Ar i-Pr ortho-CH); 7.23 (m)/127.71 (Ar meta-CH); 140.56 (Ar i-Pr ipso-C); 142.66 (Ar i-Bu ipso-CH).

Provenance & Evidence