Palladium-catalyzed allylation of pyrimidine-2,4-diones (uracils) and of 6-membered heterocyclic ambident sulfur nucleophiles
摘要:
Pd(0)-Catalyzed allylation of six-membered ambident heterocycles bearing NH-CO, NH-CS and CH2-CO moieties obey the regioselectivity rules: C>O; N>O; S>N; NH-CO>NH-CS. Uracil and 5-methyluracil (thymine) do not show regioselectivity (N-1 = N-3) whereas 6-methyluracil is regioselectively allylated at N-3 (N-3>N-1).
Palladium(O)-catalyzed alkylation of various allylic carbonates by aromatic thiols allowed the easy preparation of various allylic aryl sulphides in quite good yields. The reaction was regioselective with substitution at the less hindered side of the π-allyl system whatever the temperature of the reaction, and was diastereoselective with net retention of configuration.
Synthesis of allyl aryl sulphides by palladium(0)-mediated alkylation of thiols
作者:Catherine Goux、Paul Lhoste、Denis Sinou
DOI:10.1016/s0040-4039(00)74729-0
日期:1992.12
Various allylic aryl sulphides are readily prepared in high yields by the palladium(0)-catalyzed S-alkylation of allylic carbonates by various aromatic thiols.
Goux Catherine, Lhoste Paul, Sinou Denis, Tetrahedron, 50 (1994) N 34, S 10321-10330
作者:Goux Catherine, Lhoste Paul, Sinou Denis
DOI:——
日期:——
Baudin, J. B.; Hareau, G.; Julia, S. A., Bulletin de la Societe Chimique de France, 1993, vol. 130, p. 856 - 878
作者:Baudin, J. B.、Hareau, G.、Julia, S. A.、Lorne, R.、Ruel, O.
DOI:——
日期:——
Palladium-catalyzed allylation of pyrimidine-2,4-diones (uracils) and of 6-membered heterocyclic ambident sulfur nucleophiles
Pd(0)-Catalyzed allylation of six-membered ambident heterocycles bearing NH-CO, NH-CS and CH2-CO moieties obey the regioselectivity rules: C>O; N>O; S>N; NH-CO>NH-CS. Uracil and 5-methyluracil (thymine) do not show regioselectivity (N-1 = N-3) whereas 6-methyluracil is regioselectively allylated at N-3 (N-3>N-1).