A New One-Pot Synthetic Method
for Selenium-Containing Medium-Sized α,β-Unsaturated
Cyclic Ketones
作者:Haruki Sashida、Akemi Nakayama、Mamoru Kaname
DOI:10.1055/s-0028-1083153
日期:——
20a-h, followed by treatment with aqueous 5% H 2 SO 4 successfully led to a two-carbon ring expansion to give the 2-substituted 5,6,7,8-tetrahydroselenocin-4-ones 21a-h in 43-95% yields. Seven- to nine-membered y-selena-α,β-unsaturated cyclic ketones 22-26 and a 5,6,7,8-tetrahydrotellurocin-4-one 27 were also prepared from the corresponding selenolactones or tellurolactone in a one-pot reaction.
四氢硒吡喃-2-酮 (7) 与乙炔基锂 20a-h 反应,然后用 5% H 2 SO 4 水溶液处理,成功地导致双碳环展开,得到 2-取代的 5,6,7,8 -tetrahydroselenocin-4-ones 21a-h,产率为 43-95%。七至九元 y-硒-α,β-不饱和环酮 22-26 和 5,6,7,8-四氢碲酸-4-one 27 也由相应的硒内酯或碲内酯在一锅中制备反应。