反应详情

The compound from Step 2 (1.38 g, 1.9 mmol) was treated with 95% aqueous trifluoroacetic acid for 1.5 hours. The solvent was reduced to a few milliliters, and pipetted into 200 mL of ether/hexanes. The product was allowed to precipitate overnight at −40° C. The solid was collected, rinsed and dried; 0.75 g (91% yield).

1. customto precipitate overnight at −40° C
2. customThe solid was collected
3. washrinsed
4. customdried