2-[tert-butyl(dimethyl)silyl]oxycyclohexan-1-one

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: tert-Butyldimethylsilyloxy-cyclohexanone (3.146 g, 97%, 13.36 mmol, CAS #55145-45-4, purchased from Aldrich) was dissolved in hexanes (24 mL). tert-Butyl carbazate (1.80 g, 98%, 13.35 mmol) was added and the mixture was heated at 70° C. for 3 hours. Upon cooling to room temperature a white solid precipitated out of solution. The solid was collected by filtration, washed with hexanes and dried to give N′-[4-(tert-butyl-dimethyl-silanyloxy)-cyclohexylidene]-hydrazinecarboxylic acid tert-butyl ester (4.12 g, 90%). Upon cooling to room temperature a white solid precipitated out of solution The solid was collected by filtration washed with hexanes dried

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: tert-Butyldimethylsilyloxy-cyclohexanone (3.146 g, 97%, 13.36 mmol, CAS #55145-45-4, purchased from Aldrich) was dissolved in hexanes (24 mL). tert-Butyl carbazate (1.80 g, 98%, 13.35 mmol) was added and the mixture was heated at 70° C. for 3 hours. Upon cooling to room temperature a white solid precipitated out of solution. The solid was collected by filtration, washed with hexanes and dried to give N′-[4-(tert-butyl-dimethyl-silanyloxy)-cyclohexylidene]-hydrazinecarboxylic acid tert-butyl ester (4.12 g, 90%). Upon cooling to room temperature a white solid precipitated out of solution The solid was collected by filtration washed with hexanes dried

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

Procedure: 2-(tert.-Butyldimethylsiloxy)cyclohexanone (118 mg, 0.50 mmol) was reacted with tert.-butoxy-bis-(dimethylamino)-methane using in analogous manner the procedure described in example 45a) to give crude title compound (85 mg) as a brown oil which was used directly in the next step. MS ISP (m/e): 284.2 (100) [(M+H)+].

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: tert-Butyldimethylsilyloxy-cyclohexanone (3.146 g, 97%, 13.36 mmol, CAS #55145-45-4, purchased from Aldrich) was dissolved in hexanes (24 mL). tert-Butyl carbazate (1.80 g, 98%, 13.35 mmol) was added and the mixture was heated at 70° C. for 3 hours. Upon cooling to room temperature a white solid precipitated out of solution. The solid was collected by filtration, washed with hexanes and dried to give N′-[4-(tert-butyl-dimethyl-silanyloxy)-cyclohexylidene]-hydrazinecarboxylic acid tert-butyl ester (4.12 g, 90%). Upon cooling to room temperature a white solid precipitated out of solution The solid was collected by filtration washed with hexanes dried