反应详情

HCl 2N (13.75 ml, 27.5 mmol, 2.5 eq.) was added to a solution of the compound of formula (IV) (3 g, 11 mmol, 1 eq.) in acetone (200 ml), the final solution was stirred at 25° C. for 48 h. The solution was dried under reduced pressure affording the compound of formula (V) as yellow solid that was used in the subsequent step without further purification. Same procedure on 30 g scale proceeded smoothly. Typical yield: 97%.

1. customThe solution was dried under reduced pressure