- A new route to 1-oxo-1,2-dihydropyrimido[1,6-a]benzimidazole-4-carboxylates from ethyl 2-(benzimidazol-2-yl)-3-(dimethylamino)acrylate using solvent-free conditions
[作者:Meziane, MAA; Rahmouni, M; Bazureau, JP; Hamelin, J,期刊:Synthesis, 页码:967-969 , 文章类型: Article,,卷期:1998年-7]
- Ethyl 2-(Benzimidazol-2-yl)-3-(dimethylamino)acrylate (3) has been used as starting material to develop a mild, efficient solvent-free preparation of ethyl 1-oxo (or thioxo)-1,2- dihydro-pyrimido[1,6-a]benzimidazol-4-car...
- A short enantioselective formal synthesis of (+)-(S)-4,4-(ethylenedioxy)-7-hydroxyoct-2-enoic acid: The penultimate precursor to (-)-(R,R)-pyranophorin
[作者:Kalita, D; Khan, AT; Saikia, AK; Bez, G; Barua, NC,期刊:Synthesis, 页码:975-976 , 文章类型: Article,,卷期:1998年-7]
- Exclusive trans-addition of the nitronate dianion generated from the readily available (S)-4-acetoxy-1-nitropentane (S)-3 to methyl propiolate under PTC conditions gave adduct 4, which under carefully controlled Nef cond...
- A new and efficient access to 2,5,8-tris(dialkylamino)benzo[1,2-d : 3,4-d ': 5,6-d '']-tristhiazoles
[作者:Rossler, A; Boldt, P,期刊:Synthesis, 页码:980-982 , 文章类型: Article,,卷期:1998年-7]
- The star-shaped 2,5,8-tris(dialkylamino)benzotristhiazoles are interesting candidates in the field of discotic liquid crystals. As we found, they can be synthesized in a simple two step synthesis starting from the approp...
- Synthesis of tripeptides containing alpha,alpha-diphenylglycine by the modified Ugi reaction
[作者:Yamada, T; Omote, Y; Yamanaka, Y; Miyazawa, T; Kuwata, S,期刊:Synthesis, 页码:991-998 , 文章类型: Article,,卷期:1998年-7]
- The modified Ugi reaction has been developed to synthesize tripeptides containing alpha,alpha-diphenylglycine (Dph) together with bulky amino acids. By the use of diphenylmethanimine, N-benzyloxycarbonyl (Z) amino acids ...
- Spiro gamma-lactones via aluminum enolate-spiroepoxide openings
[作者:Taylor, SK; Chmiel, NH; Mann, EE; Silver, ME; Vyvyan, JR,期刊:Synthesis, 页码:1009-1014 , 文章类型: Article,,卷期:1998年-7]
- The opening of several spiroepoxides by aluminum ester enolates is described. The isolated gamma-hydroxy eaters are cyclized to the corresponding spirolactones with high efficiency. Alternatively, the crude product from ...
|