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2005
Oxocarboxylic acids and esters
Q 0460
Niobium(V) Chloride Catalyzed C—H Insertion Reactions of α-Diazoesters: Synof β-Keto Esters. — A wide variety of aromatic, heteroaromatic, and aliphatic
23- 082 thesis
aldehydes react with ethyl diazoacetate to give the corresponding keto esters in good
yields and with high selectivities. No side products such as glycidic esters or carbene
dimerization products are observed. Ketones fail to undergo condensation with diazo
compound (II) under the present conditions. Other diazoesters such as diethyl diazomalonate and ethyl diazoacetoacetate do not give any condensation products. —
(YADAV*, J. S.; REDDY, B. V. S.; EESHWARAIAH, B.; REDDY, P. N.;
Tetrahedron 61 (2005) 4, 875-878; Div. Org. Chem., Indian Inst. Chem. Technol.,
Hyderabad 500 007, India; Eng.) — Klein
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