Simple syntheses of hydroxamic acids and their conversion into α-hydroxy and α-amino acids
作者:Saı̈d Boukhris、Abdelaziz Souizi
DOI:10.1016/s0040-4039(00)00228-8
日期:2000.4
The nucleophilic ring opening of gem-dicyanoepoxides by LiBr or Li2NiBr4, in the presence of hydroxylamine derivatives leads to new α-halo hydroxamicacids. These compounds has been used in the synthesis of α-functionalized hydroxamicacids, α-hydroxy and α-amino acids in good yields.
Experimental and theoretical study of the [3 + 2] cycloaddition of carbonyl ylides with alkynes
作者:Ghenia Bentabed-Ababsa、Samira Hamza-Reguig、Aïcha Derdour、Luis R. Domingo、José A. Sáez、Thierry Roisnel、Vincent Dorcet、Ekhlass Nassar、Florence Mongin
DOI:10.1039/c2ob26442k
日期:——
The [3 + 2] cycloaddition reaction between carbonyl ylides generated from epoxides and alkynes (phenylacetylene, methylpropiolate, methyl but-2-ynoate and methyl 3-phenylpropiolate) to give substituted 2,5-dihydrofurans was investigated. The effect of indium(III) chloride on the outcome of the reaction was studied in the case of phenylacetylene and methylpropiolate. The thermal reaction between the
Chemoenzymatic Synthesis of α-Cyano Epoxides by a Tandem-Knoevenagel-Epoxidation Reaction
作者:Fengjuan Yang、Xiaowen Zhang、Fengxi Li、Zhi Wang、Lei Wang
DOI:10.1002/ejoc.201501501
日期:2016.3
The lipase‐mediated efficient synthesis of α‐cyano epoxides through a tandem‐Knoevenagel–epoxidation reaction is described for the first time. Besides providing a green, mild, and convenient method for the synthesis of α‐cyano epoxides, this work also extends the applicability of lipase in organic synthesis.
Hypervalent Iodine(III)-Catalyzed Epoxidation of β-Cyanostyrenes
作者:Saeesh R. Mangaonkar、Fateh V. Singh
DOI:10.1055/s-0039-1690621
日期:2019.12
radiations. The β-cyanoepoxides were isolated in good to excellent yields in a short reaction time. A convenient approach for the synthesis of β-cyanoepoxides is illustrated by iodine(III)-catalyzed epoxidation of electron-deficient β-cyanostyrenes, wherein the active catalytic iodine(III) species was generated in situ. The epoxidation of β-cyanostyrenes was performed using 10 mol% PhI as precatalyst in the
Novel tricyclic heterocycles were prepared and evaluated for their affinity to the centralbenzodiazepinereceptor. The most potent compounds with IC50's in the nanomolar range were; found among thienoquinolizines and benzo[a]quinolizines (cf. Tables 2–5). The central ring of the tricyclic ring system may be partially unsaturated (cf. Tables 2 and 4) or fully unsaturated (cf. Tables 3 and 5) without
制备新的三环杂环并评估其对中央苯并二氮杂receptor受体的亲和力。IC 50在纳摩尔范围内的最有效化合物为:在噻吩并喹啉和苯并[ a ]喹啉中发现(参见表2-5)。三环系统的中心环可以是部分不饱和的(参见表2和4)或完全不饱和的(参见表3和5),而不会丧失对受体的高亲和力。吡啶酮环中酯基的位置对于良好结合至关重要(参见表1和2)。)。它可以被各种官能团取代,例如酰胺,氨基甲酸烷基酯,烷基和羟烷基(参见表2-5)。在苯并[ a ]喹啉衍生物中,将卤素原子从C(10)移至C(9)会导致与苯并二氮杂receptor受体的亲和力完全丧失(请参阅表4)。