Diisopropylethylamine → [(S)-[(S)-2-{(5R,8S)-10,10-Dimethyl-8-[(1R,2S)-1-(pyrrolidine-1-sulfonylaminocarbonyl)-2-vinyl-cyclopropylcarbamoyl]-7-aza-dispiro[3.0.4.1]dec-7-yl}-2-oxo-1-(tetrahydro-pyran-4-yl)-ethylcarbamoyl]-(1-methyl-cyclohexyl)-methyl]-carbamic acid tert-butyl ester

Participants

Reaction Steps

A solution of (S)-tert-Butoxycarbonylamino-(1-methyl-cyclohexyl)-acetic acid (0.15 g; 0.55 mmol) (prepared according to Tetrahedron Let. 2007, 48, 6343-6347) and HATU (0.31 g; 0.82 mmol) in DCM (15 mL) was stirred for 30 min at ambient temperature. After addition of DIPEA (0.56 mL; 3.27 mmol) and (5R,8S)-7-[(S)-2-Amino-2-(4-methyl-tetrahydro-pyran-4-yl)-acetyl]-10,10-dimethyl-7-aza-dispiro-[3.0.4.1]decane-8-carboxylic acid [(1R,2S)-1-(pyrrolidine-1-sulfonylaminocarbonyl)-2-vinyl-cyclopropyl]-amide (0.412 g; 0.55 mmol) in DCM (5 mL) the reaction mixture was stirred for 3 h, the solvent was removed in vacuo and the residue was purified by preparative HPLC (method L) to yield the title compound. LC-MS (method E): Rt=2.78 min; M/z=859 [M+], HPLC (method A3) Rt=6.81 min

Provenance & Evidence