Application of a recyclable fluorous oxime in the convenient synthesis of 3-amino-1,2-benzisoxazoles and 4-amino-1H-2,3-benzoxazines
作者:Wei Jie Ang、Chi-Yuan Chu、Tzyy-Chao Chou、Lee-Chiang Lo、Yulin Lam
DOI:10.1039/c3gc36966h
日期:——
A microwave-assisted, fluorous synthetic route to 3-amino-1,2-benzisoxazoles and 4-amino-1H-2,3-benzoxazines has been developed. The strategy comprises linking the respective 2-fluorobenzonitrile or 2-(bromomethyl)benzonitrile to a fluorous oxime tag to give an aryloxime intermediate which then undergoes cyclization with concomitant cleavage of the substrate-tag in acidic conditions to provide the
已开发出一种微波辅助的氟合成路线,用于 3-氨基-1,2-苯并恶唑和4-氨基-1 H -2,3-苯并恶嗪。该策略包括将各自的2-氟苄腈或2-(溴甲基)苄腈与氟肟标签连接,得到芳基肟中间体,然后将其进行环化,同时在酸性条件下将底物标签裂解,从而提供所需的产物,中等至中等产量。另外,可以使芳基肟中间体进一步反应以扩展化合物库。可以使用氟固相萃取(F-SPE)轻松分离产物,回收的氟酮可以转化回氟肟,并在下一轮合成中重复使用。