Tetrafluoroboric acid → HCID 15840530, compound

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Reaction Steps

Reaction Schemes 1 and 2 provide examples for the synthesis of derivatives of 5,6,7,8-tetrahydro-5,5,8,8-tetramethylnaphthalene-2-carboxylic acid, which are within the scope of Formula 2 and which are reacted with an amine of Formula 3 to provide (5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-naphthalene-2-yl)carbamoyl derivatives within the scope of Formula 1. Thus, as is shown in Reaction Scheme 1, ethyl 5,6,7,8-tetrahydro-5,5,8,8-tetramethylnaphthalene-2-carboxylate (Compound A) is nitrated to provide the corresponding 3-nitro compound (Compound B). The nitro group of Compound B is reduced to provide the corresponding 3-amino compound (Compound C) which is described in the publication Lehmann et al. Cancer Research, 1991, 51, 4804. Ethyl 5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-3-aminonaphthalene-2-carboxylate (Compound C) is brominated to yield the corresponding 4-bromo derivative (Compound D), which is converted by treatment with isoamylnitrite and reduction with H3PO2, to ethyl 5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-4-bromonaphthalene-2-carboxylate (Compound E). Saponification of Compound E yields 5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-4-bromonaphthalene-2-carboxylic acid (Compound F) which is used as a reagent in accordance with Formula 2. Ethyl 5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-3-aminonaphthalene-2-carboxylate (Compound C) is also diazotized and reacted with HBF4 to provide ethyl 5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-3-fluoronaphthalene-2-carboxylate (Compound G) which serves either per se or after saponification as a reagent in accordance with Formula 2.

Provenance & Evidence