Selective Oxidation of Zirconocyclopentenes via Organoboranes
作者:Jeffrey S. T. Gorman、Scott T. Iacono、Brian L. Pagenkopf
DOI:10.1021/ol036031r
日期:2004.1.1
described for oxidation of zirconocyclopent-2-enes selectively at the sp(3) carbon by efficient transfer to electrophilic ((c)Hex)(2)BCl followed by oxidation with H(2)O(2)/NaOH to afford 1-alkylidene-2-hydroxymethylcyclopentanes. Results with several substrates show that overall reaction efficiencies for the zirconocene-mediated enyne cyclization, boron transmetalation, and oxidation sequence are generally