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CAPLUS COPYRIGHT 2011 ACS
||Preparation of indolinonecarboxylates.
||Merten, Joern; Renner, Svenja; Reichel, Carsten
||Boehringer Ingelheim International G.m.b.H., Germany
||PCT Int. Appl., 29pp. CODEN: PIXXD2
Title compds. [I; R1 = H, ClCH2CO; R2, R3 = H; R2R3 = :C(OMe)Ph; when R1 = H, then R2R3 = :C(OMe)Ph], were prepared Thus, di-Me malonate was heated with Na tert-amylate and Me 4-chloro-3-nitrobenzoate (preparation given) in N-methylpyrrolidone to give 95.4% di-Me [4-(methoxycarbonyl)-2-nitrophenyl]propanedioate. This was hydrogenated in HOAc over Pd/C at 45 degrees followed by heating at 115 degrees to give 87.2% 6-methoxycarbonyl-2-oxindole.
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