2,2-dimethylpropane-1-sulfonyl chloride

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

Procedure: Off-white solid. MS (ESI): 459.16 (MH+). This example was prepared in analogy to example 1 step C) to D) from 4-(2-methoxy-ethyl)-piperidine-4-carboxylic acid ethyl ester (example 1 step B)), 2,2-dimethyl-propane-1-sulfonyl chloride and methanesulfonic acid 4-amino-phenyl ester.

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

Procedure: Light brown solid. MS (ESI): 415.2 (MH+). This example was prepared in analogy to example 1 step C) to D) from 4-(2-methoxy-ethyl)-piperidine-4-carboxylic acid ethyl ester (example 1 step B)), 2,2-dimethylpropane-1-sulfonyl chloride and 4-ethyl-aniline.

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

Procedure: To a solution of 4-(2-methoxy-ethyl)-piperidine-4-carboxylic acid ethyl ester (0.72 g) in methylene chloride (40 ml) was added at RT under an argon atmosphere DMAP (0.75 g) and then dropwise 2,2-dimethyl-propane-1-sulfonyl chloride (0.57 ml). The reaction mixture was stirred 12 h at RT then partitioned between AcOEt and aqueous 1M HCl, the layers were separated and the aqueous layer washed with 2M aqueous KHCO3 then dried over Na2SO4. The solvent was evaporated off, the residue purified by flash chromatography (AcOEt/heptane, gradient from 0 to 40%) to give the desired 1-(2,2-dimethyl-propane-1-sulfonyl)-4-(2-methoxy-ethyl)-piperidine-4-carboxylic acid ethyl ester (0.34 g) as a light yellow viscous oil. then partitioned between AcOEt and aqueous 1M HCl the layers were separated the aqueous layer washed with 2M aqueous KHCO3 then dried over Na2SO4 The solvent was evaporated off the residue purified by flash chromatography (AcOEt/heptane, gradient from 0 to 40%)

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

Procedure: The title compound was prepared in analogy to example 2 step B from a mixture of (5SR,6RS)-6-hydroxy-2-[4-(2,2,2-trifluoro-ethyl)-phenyl]-2,8-diaza-spiro[4.5]decan-1-one (described in example 7 step B) and 2,2-dimethyl-propane-1-sulfonyl chloride. Light yellow solid. MS (ESI): 463.2 (MH+)