The present invention relates to a new one-pot synthesis employing 4-(4-bromo-3-(hydroxymethyl)phenoxy)benzonitrile (compound B) for preparing (4-[(1-hydroxy-1,3-dihydro-2,1-benzoxaborol-5-yl)oxy]benzonitrile (crisaborole) and pharmaceutically acceptable salts thereof in high yield and high purity. The novel process of the present invention is particularly suitable for industrial scale manufacture of crisaborole and its salts with excellent purity and good yields. The present invention also describes an intermediate, 4-(3-formyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenoxy)benzonitrile (compound I), which is inter alia suitable for preparing (4-[(1-hydroxy-1,3-dihydro-2, 1-benzoxaborol-5-yl)oxy]benzonitrile (crisaborole) and pharmaceutically acceptable salts thereof, as well as a another process suitable for industrial scale applications, employing the intermediate compound I in the preparation of crisaborole and pharmaceutically acceptable salts thereof, in high yield and high purity.
本发明涉及一种新的一锅法合成,采用4-(4-
溴-3-(羟甲基)苯氧基)苯腈(化合物B)制备(4-[(1-羟基-1,3-二氢-2,1-苯并
硼杂-5-基)氧基]苯腈(克瑞索布罗)及其在高收率和高纯度下的药学可接受盐。本发明的新工艺特别适用于工业规模制造具有优异纯度和良好收率的克瑞索布罗及其盐。本发明还描述了一种中间体,4-(3-甲酰基-4-(4,4,5,5-四甲基-1,3,2-二氧杂
硼杂
环戊烷-2-基)苯氧基)苯腈(化合物I),该中间体适用于制备(4-[(1-羟基-1,3-二氢-2,1-苯并
硼杂-5-基)氧基]苯腈(克瑞索布罗)及其药学可接受盐,以及另一种适用于工业规模应用的工艺,采用中间体化合物I制备克瑞索布罗及其药学可接受盐,在高收率和高纯度下。