Novel benzyne additions to the 1,2,5-thiadiazole and 1,2,5-selenadiazole ring systems
作者:Martin R. Bryce、Peter Hanson、John M. Vernon
DOI:10.1039/c39820000299
日期:——
Novel Modes of benzyneaddition to 3,4-dimethyl-1,2,5-thiadiazole and 3,4-dimethyl-1,2,5-selenadiazole afford methyl derivatives of three heterocyclic systems: quinoxaline, 1,2-benzisothiazole, and 1,3-benzoselenazole respectively.
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.