Hexacarbonylmolybdenum-induced Reaction of Isoxazoles. Cycloaddition of Isoxazoles with Acetylenic Esters and Related Reactions
作者:Tomoshige Kobayashi、Makoto Nitta
DOI:10.1246/bcsj.58.152
日期:1985.1
undergo a cycloaddition reaction with dimethyl acetylenedicarboxylate across the C-4–C-5 bond to give 3,4-bis(methoxycarbonyl)pyridine derivatives. In a similar cycloadition of isoxazoles with methylpropiolate, 4-(methoxycarbonyl)pyridine derivatives were also obtained. The β-carbon atom of methylpropiolate could intervene in the bonding with the C-5 position of the isoxazoles regioselectively. A mechanism
HEXACARBONYLMOLYBDENUM-INDUCED FORMATION OF PYRIDINES FROM ISOXAZOLES AND ACETYLENIC ESTER
作者:Tomoshige Kobayashi、Makoto Nitta
DOI:10.1246/cl.1983.1233
日期:1983.8.5
Upon treatment with Mo(CO)6 in anhydrous benzene, substituted isoxazoles undergo a novel inclusion of dimethyl acetylenedicarboxylate across the C4–C5 bond and loss of an oxygen atom to lead to pyridines.
KOBAYASHI, TOMOSHIGE;NITTA, MAKOTO, CHEM. LETT., 1983, N 8, 1233-1236
作者:KOBAYASHI, TOMOSHIGE、NITTA, MAKOTO
DOI:——
日期:——
Novel Conversion of Selenium-containing Five-membered Aromatics to Nitrogen-containing Six-membered Aromatics via Hetero Diels–Alder Reaction with Acetylenic Dienophiles
Treatment of selenium-containing five-membered heteroaromatics with acetylenic dienophiles afforded several nitrogen heterocycles in good to moderate yields by using thermal reaction conditions. These reactions were thought to proceed through sequential [4+2] cycloaddition-selenium extrusion pathway.