Application of the intramolecular wadsworth-emmons reaction to bicyclo[3.3.0]oct - Δ1,2 - en - 3 - ones. Synthesis and x-ray structure of a novel
作者:Michael J. Begley、Kelvin Cooper、Gerald Pattenden
DOI:10.1016/0040-4020(81)80017-8
日期:1981.1
The cyclisation of β,ϵ-diketophosplionates is shown to provide an expeditious route to bicyclo[3.3.0]oct - Δ1,2 - en - 3 - ones, which lack substitoents at C-2 and C-5. Application of the method to the parent member 12 results in the formation of a novel dimer 16 whose structure has been determined by X-ray crystallography. The dimer is thought to derive from 12 by a double Michael addition sequence
Intramolecular reactions of Fischer Carbene complexes with alkynes and a mechanistic study of the interception of reactive intermediates with added acetylenes
作者:Benjamin A. Anderson、Jianming Bao、Timothy A. Brandvold、Cynthia A. Challener、William D. Wulff、Yao Chang Xu、Arnold L. Rheingold
DOI:10.1021/ja00076a028
日期:1993.11
and the internal alkyne in the carbene complex. All four of the possible phenol products of this reaction were independently synthesized, and the product distribution among the four isomers and the cyclopentenedione was investigated as a function of solvent, concentration, and the nature of the metal. The results of these experiments suggest that the phenol 13 arises from a vinylcarbene complexed intermediateand