conditions of the Heckreaction, 9-benzyl-6-iodopurine affords mainly the corresponding 6,6′-dimer, the Heck product being formed only in low yield (≤12 %). With 7-benzyl-6-iodopurine the dimerization is suppressed and the Heck product is obtained in 32–91 % yield. 9-Substituted 6-chloro-2-iodopurines react smoothly, giving 2-alkenyl-6-chloropurines in 71–97 % isolated yields. The reaction proceeds with
Synthesis of Purinecarbonitriles by Pd(0)-Catalysed Coupling of Halopurines with Zinc Cyanide.
作者:Lise-Lotte Gundersen、Klaus Bechgaard、Klaus Bechgaard、Jon Songstad、Markku Leskelä、Mika Polamo、Muhammed Nour Homsi、Frank K. H. Kuske、Monika Haugg、Nathalie Trabesinger-Rüf、Elmar G. Weinhold
DOI:10.3891/acta.chem.scand.50-0058
日期:——
Pd(0)-catalysed coupling of halopurines with zinc cyanide allows the smooth introduction of the cyano group into the purine 2-, 6- and 8-positions. Pronounced ligand effects were observed, and tetrakis(tri-2-furylphosphine)palladium(0) was found to be the catalyst of choice in reactions where tetrakis(triphenylphosphine)palladium(0) failed.
Mitsunobu Reactions for the Synthesis of Carbocyclic Analogues of Nucleosides: Examination of the Regioselectivity<sup>1</sup>
作者:Akemi Toyota、Nobuya Katagiri、Chikara Kaneko
DOI:10.1080/00397919308011216
日期:1993.5
In order to provide a general synthetic method for carbocyclic nucleosides, regioselectivities in Mitsunobu reaction of purine, pyrimidin-2-one and their substituted derivatives with a variety of alcohols were examined and found to depend upon both substituents of the bases and kind of the alcohols.
Gundersen Lise-Lotte, Bakkestuen Anne Kristin, Aasen Arne Jorgen, Overas +, Tetrahedron, 50 (1994) N 32, S 9743-9756
作者:Gundersen Lise-Lotte, Bakkestuen Anne Kristin, Aasen Arne Jorgen, Overas +