Oxalyl chloride → HCID 58114143, compound

Participants

Reaction Conditions

Reaction Steps

(1S,6S)-4,6-Dimethyl-cyclohex-3-ene-carboxylic acid (3.04 g, 19.7 mmol) was dissolved in CH2Cl2 (30 mL) and DMF (20 μL) was added. The solution was cooled to 0° C. and then (COCl)2 (3.7 mL, 39 mmol) was added slowly. The reaction was stirred in an ice bath for 2 hours and then concentrated. The residue was taken up in hexanes and concentrated; this hexanes coevaporation was repeated once more. To the residue was added [5-(3,3-dimethyl-but-1-ynyl)-thiophen-3-yl]-(1,4-dioxa-spiro[4.5]dec-8-yl)-amine (4.16 g, 13 mmol), diisopropylethylamine (4.5 mL, 26 mmol), and 1,2-dichloroethane (40 mL) at 0° C. The solution was warmed to room temperature and stirred overnight. The reaction was diluted with CH2Cl2, twice washed with saturated NH4Cl (aq), dried over MgSO4, filtered, concentrated, and purified by silica gel column chromatography, eluting with a mixture of 0-75% EtOAc/hexanes, to give (1S,6S)-4,6-dimethyl-cyclohex-3-ene-carboxylic acid [5-(3,3-dimethyl-but-1-ynyl)-thiophen-3-yl]-(1,4-dioxa-spiro[4.5]dec-8-yl)-amide (5.6 g, 12 mmol) as a single isomer.

Provenance & Evidence