New approach to the synthesis of dibenzodithia-and benzothiaazacrown ethers via the aromatization of 2-alkylthio(arylthio)cyclohexanes during bromination
Application of directed metalation in synthesis. Part 6: A novel anionic rearrangement under directed metalation conditions leading to heteroannulation
作者:Tarun Kanti Pradhan、Chandrani Mukherjee、Sukanta Kamila、Asish De
DOI:10.1016/j.tet.2004.04.033
日期:2004.6
from easily available phenols is described. The key step in this synthesis is a hitherto unreported anionic rearrangement under directed metalation conditions. The rearrangement occurs after side chain deprotonation of a methyl sulfanyl group by an O-carbamate directed metalating group and the reaction mixture is kept at room temperature for 8–12 h. Acid-mediated cyclisation of the rearranged product
309. Benz-1 : 3-oxathioles, benz-1 : 4-oxathien, and αω-bisarylthioalkanes
作者:Douglas Greenwood、Herbert A. Stevenson
DOI:10.1039/jr9530001514
日期:——
New approach to the synthesis of dibenzodithia-and benzothiaazacrown ethers via the aromatization of 2-alkylthio(arylthio)cyclohexanes during bromination