salts of 2-, 3- and 4-pyridinecarboxylic acids undergo deprotonation at the position adjacent to the carboxylate group when treated with LTMP in THF at 0 °C, −50 °C and −25 °C, respectively. The lithiation conditions could be extended to chloronicotinic acids, and even to an activated benzoic acid.
Regioselective synthesis of 1,8-diazaanthracene-9,10-dione by tandem directed ortho-metallation/metal-halogen exchange
作者:Mercedes Villacampa、Elena de la Cuesta、Carmen Avendaño
DOI:10.1016/0040-4020(94)01004-j
日期:1995.1
Tandem directed ortho-metallation/metal-halogen exchange reactions between N,N-diethyl-pyridine-2-carboxamide and 2-bromopyridine-3-carbaldehyde yield 1,8-diazaanthracene-9,10-dione. This compound has been further functionalized to its N-oxide and the corresponding 2,9,10-trione derivative, structurally related to the antibiotic diazaquinomycin A.
Jeiteles, Monatshefte fur Chemie, 1901, vol. 22, p. 846
作者:Jeiteles
DOI:——
日期:——
Villacampa Mercedes, de la Cuesta Elena, Avendano Carmen, Tetrahedron, 51 (1995) N 4, S 1259-1264
作者:Villacampa Mercedes, de la Cuesta Elena, Avendano Carmen
DOI:——
日期:——
EPSZTAJN, J.;BRZEZINSKI, J. Z.;JOZWIAK, A., J. CHEM. RES. SYNOP., 1986, N 1, 18-19