through CNbondcleavage. In the presence of 5 mol% palladium diacetate, 10 mol% 1,4‐bis(diphenylphosphino)butane (dppb), and 5 mol% p‐toluenesulfonic acid (TsOH), a range of α‐unbranched primary allylic amines smoothly underwent deammoniative condensation with nonallylic amines in an α‐selective fashion to give structurally diverse secondary and tertiary amines in good to excellent yields and E selectivity
Hoveyda–Grubbs catalysts with an N→Ru coordinate bond in a six-membered ring. Synthesis of stable, industrially scalable, highly efficient ruthenium metathesis catalysts and 2-vinylbenzylamine ligands as their precursors
作者:Kirill B Polyanskii、Kseniia A Alekseeva、Pavel V Raspertov、Pavel A Kumandin、Eugeniya V Nikitina、Atash V Gurbanov、Fedor Ivanovich Zubkov
DOI:10.3762/bjoc.15.73
日期:——
of this chemistry is further demonstrated by the tests of the novel catalysts (up to 10−2 mol %) in different metathesis reactions such as cross metathesis (CM), ring-closingmetathesis (RCM) and ring-opening cross metathesis (ROCM).
Influence of the N→Ru Coordinate Bond Length on the Activity of New Types of Hoveyda–Grubbs Olefin Metathesis Catalysts Containing a Six-Membered Chelate Ring Possessing a Ruthenium–Nitrogen Bond
作者:Pavel A. Kumandin、Alexandra S. Antonova、Kseniia A. Alekseeva、Eugeniya V. Nikitina、Roman A. Novikov、Kirill A. Vasilyev、Anna A. Sinelshchikova、Mikhail S. Grigoriev、Kirill B. Polyanskii、Fedor I. Zubkov
DOI:10.1021/acs.organomet.0c00647
日期:2020.12.28
efficient approach to the synthesis of new types of Hoveyda–Grubbs catalysts containing an N→Ru bond in a six-membered chelate ring is proposed. The synthesis of the organometallic compounds is based on the interaction of ready accessible 2-vinylbenzylamines and 1,3-bis(2,4,6-trimethylphenyl)-2-trichloromethylimidazolidine ligands with dichloro(3-phenyl-1H-inden-1-ylidene)bis(tricyclohexylphosphane)ruthenate
提出了一种高效的新型Hoveyda-Grubbs催化剂合成方法,该催化剂在六元螯合环中包含N→Ru键。有机金属化合物的合成基于容易获得的2-乙烯基苄胺和1,3-双(2,4,6-三甲基苯基)-2-三氯甲基咪唑烷配体与二氯(3-苯基-1 H -inden-1 )的相互作用-亚烷基)双(三环己基膦)钌酸盐,它以70-80%的收率提供了目标钌络合物。通过在不同的烯烃交叉复分解(CM)和闭环复分解(RCM)反应中测试催化剂,突出了所获得的螯合物的实用性和潜在应用领域。这些实验显示出很高的催化性能(高达10 –2mol%)在较宽的温度范围内合成的所有结构。通过X射线晶体学对所得钌催化剂的结构特性进行了彻底研究,这使得金属配合物的结构与其催化性能之间具有可靠的关联。结果表明,六元螯合环中钌与氮的键长对催化剂的稳定性和效率影响最大。通常,N→Ru键越短越强,该配合物的稳定性越高,其催化特性越差。反过来,可
Fluoride-induced activation of molybdenum hexacarbonyl: formation of esters and lactones from alkyl iodides
In the presence of fluoride ion, alkyl iodides RI are carbonylated by molybdenum hexacarbonyl to esters RCO2R, and diiodides lead to good yields of the corresponding lactones.
Structure-based design of inhibitors of purine nucleoside phosphorylase. 3. 9-Arylmethyl derivatives of 9-deazaguanine substituted on the arylmethyl group
作者:Mark D. Erion、Shri Niwas、Jerry D. Rose、Subramaniam Ananthan、Mark Allen、John A. Secrist、Y. Sudhakar Babu、Charles E. Bugg、Wayne C. Guida
DOI:10.1021/jm00076a004
日期:1993.11
in the design of a potent series of mammalian purinenucleosidephosphorylase (PNP) inhibitors. Enhanced potency was achieved by designing substituted 9-(arylmethyl)-9-deazaguanine analogs that interact favorably with all three of the binding subsites of the PNP active site, namely the purine binding site, the hydrophobic pocket, and the phosphate binding site. The most potent PNP inhibitor prepared