Organic Letters 2000-12-14

Two general routes to 1,4-disubstituted-2,3,4,5-tetrahydro- 1H-3-benzazepines.

S W Gerritz, J S Smith, S S Nanthakumar, D E Uehling, J E Cobb

Index: Org. Lett. 2(25) , 4099-102, (2000)

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Abstract

[structure] Two general routes to 1,4-disubstituted-2,3,4, 5-tetrahydro-1H-3-benzazepines are described. Both routes utilize an appropriately functionalized phenethylamino alcohol as the penultimate intermediate: the first route makes use of the reductive amination of a benzyl alkyl ketone with alpha-(aminomethyl)benzyl alcohol, while the second route utilizes the addition of a Grignard reagent to the oxazolidine derived from a substitued phenylacetaldehyde and alpha-(methylaminomethyl)benzyl alcohol. In all cases studied, the cis-1,4-disubstituted-2,3,4, 5-tetrahydro-1H-3-benzazepine was obtained as the major product.

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