Phthalimide → rac-Benzyl[1-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-4,4,4-trifluorobutan-2-yl]carbamate

Participants

Reaction Steps

Under argon, 1.58 g of rac-benzyl (4,4,4-trifluoro-1-hydroxybutan-2-yl)carbamate (Example 43A, 5.70 mmol, 1 equivalent), 0.84 g of 1H-isoindole-1,3(2H)-dione (phthalimide, 5.70 mmol, 1 equivalent) and 2.24 g of triphenylphosphine (8.54 mmol, 1.5 equivalents) were dissolved in 28 ml of THF, and 1.84 g of di-tert-butyl (E)-diazene-1,2-dicarboxylate (DIAD, 8.54 mmol, 1.5 equivalents) were added at RT. The mixture was stirred at RT for 30 min and then a water/acetonitrile mixture was added. Purification by means of preparative HPLC (RP18 column, eluent:acetonitrile/water gradient with addition of 0.1% TFA) gave 1.92 g (79% of theory) of the title compound.

Provenance & Evidence