反应详情

Into a solution of 8 (9.19 g, 33.0 mmol) in anhydrous THF (200 mL) at 0° C. was added N,N-diisopropylethylamine (DIEA) (28.7 mL, 165 mmol) and 4-chlorophenyl isocyanate (5.07 g, 33.0 mmol). The solution was stirred at RT overnight before concentrating under reduced pressure. The crude material was purified on a silica gel column eluted with 10% moving to 50% EtOAc in hexanes. Combined and concentrated pure fractions. Remaining EtOAc was azeotroped off with acetonitrile and was lyophilized from acetonitrile/water to give 9 (13.37 g, 94%) as a solid. MS: APCI (AP+): 432.1 (M)+, (AP−): 430.1 (M)−.

1. concentrationbefore concentrating under reduced pressure
2. customThe crude material was purified on a silica gel column
3. washeluted with 10%
4. concentrationconcentrated pure fractions
5. customRemaining EtOAc was azeotroped off with acetonitrile