1-cyclohexyl-2-diazoethanone

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1-Cyclohexyl-2-diazoethanone (I, PREPARATION 2, 3.1 g) and ethenylidene bisphosphonic acid tetraethyl ester (II, PREPARATION 1, 6.00 g) are stirred in ether (20 ml) for 24 hrs at 22°. The precipitate is filtered, washed with ether, then recrystallized from ethyl acetate to give the title compound, mp 166°-165°; MS (m/e) 452, 341, 315, 287, 259, 241, 223 and 205; IR (mineral oil mull) 3186, 1656, 1552, 1449, 1267, 1253, 1241, 1162, 1041, 1019, 995 and 969 cm-1 ; NMR (CDCl3) 6.77, 4.24, 3.45, 3.24 and 1.9-1.2 δ. The precipitate is filtered washed with ether recrystallized from ethyl acetate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of diazomethane is prepared from N-methyl-N'-nitro-N-nitroso guanidine (12.5 g), potassium hydroxide (50%, 20 ml), and ether (300 ml). TEA (7.7 ml) is added to the diazomethane solution (65%) followed by cyclohexane carboxylic acid chloride (7.4 ml) slowly at 0° . The reaction is stirred at 0° for 1 hr then for 18 hrs at 22° . A porecipitate forms, it is filtered and washed with ether, and the filtrate concentrated. The resulting oil is cooled to -78° , triturated with ether, then warmed to 22° and concentrated with reduced pressure and heat to give the title compound as an oil, NMR (acetone-d6) 5.4 and 1.4-0.8 δ. for 18 hrs at 22° A porecipitate forms, it is filtered washed with ether the filtrate concentrated The resulting oil is cooled to -78° triturated with ether warmed to 22° concentrated with reduced pressure heat