Ethanol → HCID 69359627, compound

Participants

Reaction Steps

To a solution of methyl 1-acetyl-4-(1,1-dioxidotetrahydro-2H-1,2-thiazin-2-yl)-2,3-dihydro-1H-indole-6-carboxylate (D235) (300 mg, 0.85 mmol, 1 equiv) in THF (20 ml) at room temperature was added BH3 (1.5 M in THF, 2 ml, 3 mmol, 3.5 equiv) and the resulting mixture was stirred at room temperature for 15 h. EtOH (5 ml) was added and the resulting mixture was concentrated in vacuo after 5 min. The residue was partitioned between a 2N aqueous HCl solution (20 ml) and CH2Cl2 (20 ml) and the biphasic mixture was vigorously stirred for 3 h. The two layers were separated and the organic phase was dried over MgSO4 and concentrated in vacuo. Purification of the residue by flash chromatography on silica gel (AcOEt/iso-hexane: 1/2) gave methyl 4-(1,1-dioxidotetrahydro-2H-1,2-thiazin-2-yl)-1-ethyl-2,3-dihydro-1H-indole-6-carboxylate (B145) (200 mg, 70%) as a very pale yellow solid. [M+H]+=339.2, RT=2.92 min.

Provenance & Evidence