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Methanetricarboxylates have been used as "blocked" malonic esters, restricting reaction with alkyl halides to monoalkylation. The unwanted carboxyl group can be removed by treatment with Na alkoxide, LDA or BCl3. Provides a useful 2-carbon chain extension method that adds to Michael acceptors under phase-transfer conditions. Triethyl Methanetricarboxylate is used in the synthesis of novel inhibitors of Hsp90. It is also used in the preparation of novel dihydroquinoline-3-carboxylic acids that function as HIV-1 integrase inhibitors.
Giancarlo Cravotto, et al. Dehydrative alkylation of alcohols with triethyl methanetricarboxylate under Mitsunobu conditions.Tetrahedron.,1996,50(40), 13007-13016.
Teruaki Mukaiyama, et al. Stereoselective Carbon-Carbon Bond Forming Reactions between Various Chiral Alkyl Aryl Carbinols and Triethyl Methanetricarboxylate by Oxidation-Reduction Condensation Using Alkyl Diphenylphosphinites.Chem. Lett.,2005,34(12), 1676-1677.
Methanetricarboxylates have been used as "blocked" malonic esters, restricting reaction with alkyl halides to monoalkylation. The unwanted carboxyl group can be removed by treatment with Na alkoxide, LDA or BCl3: J. Org. Chem., 44, 3492 (1979). Adds to Michael acceptors under phase-transfer conditions, providing a useful 2-carbon chain extension method: Synthesis, 1125 (1990):
Under similar conditions, diethyl malonate gives only 36% yield.
The tricarboxylate also undergoes free-radical addition to the terminal position of alkenes: Angew. Chem. Int. Ed., 5, 586 (1966). Arylation with electron-rich aromatics is promoted by Mn(III): Synthesis, 567 (1991).