Synthesis of unsaturated bicyclic lactones and acetals via palladium-promoted cyclization of cyclic allylic alcohols
作者:Richard C. Larock、Dean E. Stinn
DOI:10.1016/s0040-4039(00)99120-2
日期:1989.1
Unsaturated bicyclic lactones are readily prepared by converting cyclic allylic alcohols to the corresponding α-chloromercurio acetate esters and reacting them with Li2PdCl4. The corresponding acetals can be synthesized directly by reaction of the allylic alcohols with ethyl vinyl ether and Pd(OAc)2.
Catalysis by lithium perchlorate in dichloromethane: Diels-Alder reactions and 1,3-Claisen rearrangements
作者:Manfred T. Reetz、Andreas Gansäuer
DOI:10.1016/s0040-4020(01)87187-8
日期:1993.7
Lithium perchlorate suspended in dichloromethane is an efficient catalyst (4 – 25 mol-%) for stereoselective Diels-Alder, hetero-Diels-Alder and regioselective 1,3-Claisen rearrangements; this process is milder, safer and environmentally less precarious than the use of 1 – 5 molar solution of LiClO4 in ether described previously in the literature.