Palladium-Catalyzed Cross-Coupling of Internal Alkenes with Terminal Alkenes to Functionalized 1,3-Butadienes Using CH Bond Activation: Efficient Synthesis of Bicyclic Pyridones
cross‐coupling of internal alkenes of α‐oxoketene dithioacetals with terminal alkenes has been successfully realized by palladium‐catalyzedCH bond activation, affording functionalized 1,3‐butadienes. Condensation of the resultant 1,3‐butadienes by diamines efficiently produced potentially bioactive bicyclic pyridone derivatives (see scheme).
The aza–ene or the Michael addition? Examination of an unusual substituent effect on the reaction of heterocyclic ketene aminals with ethyl propiolate
作者:Mei-Xin Zhao、Mei-Xiang Wang、Zhi-Tang Huang
DOI:10.1016/s0040-4020(02)00002-9
日期:2002.2
group underwent the aza–ene reaction with ethylpropiolate under various conditions to yield the corresponding adducts, which were readily transformed into the δ-lactam fused heterocyclic products with or without the aid of sodium ethoxide in refluxing ethanol, while the ester- and cyano-substituted tertiary enediamines acted as the strong Michael donor to add to ethylpropiolate in a polar or a protic
Synthesis of Imidazo[1,2-a]pyridine and Pyrido[1,2-a]pyrimidine Derivatives by the Addition and Cyclocondensation Reactions of Ketenaminals Containing Imidazolidine or Hexahydropyrimidine Ring with Esters of a,b-Unsaturated Acids
作者:Zhi-Tang Huang、Zhi-tang Huang、Zhi-rong Liu
DOI:10.3987/r-1986-08-2247
日期:——
HUANG ZHI-TANG; LIU ZHI-RONG, HETEROCYCLES, 24,(1986) N 8, 2247-2254