Synthesis of Indenol- and Azulenol Derivatives via Platinum Dichloride-Catalyzed Intramolecular Hydroxy- or Alkoxycyclization of Cyclic Dienynes
作者:Ming-Chang P. Yeh、Wen-Cheng Tsao、Sau-Tin Cheng
DOI:10.1021/jo702424w
日期:2008.4.1
cyclization reaction proceeds via a cyclopropyl platinacarbene intermediate and allows for the direct stereocontrol of three contiguous stereogenic centers of the fused bicyclic skeletons. The transient reactive intermediate obtained from PtCl2-catalyzed cyclization reaction of a cyclohexadienyndiol can be trappedintramolecularly by a hydroxylgroup to afford an oxatricyclo[5.4.0.04,8]undecane ring skeleton
Palladium(II)-catalyzed carbocyclization: Vinylpalladium in 1,4-oxidation of conjugated dienes
作者:Ylva I.M. Nilsson、Roberto G.P. Gatti、Pher G. Andersson、Jan-E. Bäckvall
DOI:10.1016/0040-4020(96)00265-7
日期:1996.5
containing a terminal or internal triple bond. A vinylpalladium species formed by chloropalladation of the alkyne inserts one of the double bonds of the diene in a Heck-type reaction. The addition of palladium and chloride over the triple bond is non-stereoselective while the overall 1,4-addition by carbon and chloride over the diene is highly stereoselective and occurs anti. The stereoselectivity of the