反应详情

A solution of ((3S*,4R*)-1-benzyl-4-{[isopropyl-(2-nitro-benzenesulfonyl)-amino]-methyl}-pyrrolidin-3-ylmethyl)-isopropyl-carbamic acid tert-butyl ester (8.9 g, 23.02 mmol), 2-mercaptoethanol (0.81 mL, 11.60 mmol), and DBU (0.79 mL, 5.27 mmol) in CH3CN (10 mL) is stirred for 2 h at room temperature. The mixture is concentrated and then diluted with Et2O and H2O. The organic layer is separated, and the aqueous phase is extracted 3 times with Et2O. The combined organic extracts are dried (MgSO4), and the solvent is concentrated to give the title compound which is used without further purification in the next step. TLC, Rf (AcOEt)=0.61. MS (LC-MS): 404.3 [M+H]+; tR (HPLC, C18 column, 10-100% CH3CN/H2O/5 min, 100% CH3CN/2.5 min, CH3CN and H2O containing 0.1% TFA, flow: 1.5 mL/min): 4.45 min.

1. concentrationThe mixture is concentrated
2. additiondiluted with Et2O and H2O
3. customThe organic layer is separated
4. extractionthe aqueous phase is extracted 3 times with Et2O
5. dry with materialThe combined organic extracts are dried (MgSO4)
6. concentrationthe solvent is concentrated