Hydroxylamine as an ammonia equivalent: access to NH-tetrahydroisoquinolonic derivatives from aldoximes by the Castagnoli–Cushman reaction followed by reduction
2019
A novel synthetic protocol towards trans -NH-tetrahydroisoquinolonic acid esters is based on the Castagnoli–Cushman reaction between aromatic aldehyde oximes and homophthalic anhydride, followed by esterification and TiCl 3 -promoted reduction. The scope of the method with respect to the aromatic portion (both electron-rich and electron-deficient) is broader compared to the earlier described approaches, which makes it a suitable synthetic strategy for the structure–activity exploration.
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