Alkene and enyne metathesis reactions on allylic and propargylic amines
摘要:
Treatment of cis-4,5-diaminocyclohexene derivatives bearing allyl or propargyl groups on the nitrogen atoms, with first or second generation Grubbs metathesis catalysts, results in initiation of metathesis cascades which include ring-opening of the unstrained cyclohexene ring. This contrasts with the previous work on the analogous cyclohexene ethers where metathesis reactions occurred exclusively between the side-chains and no ring-opening of the cyclohexene unit was observed. (c) 2007 Elsevier Ltd. All rights reserved.
Cyclopentanedi- and tricarboxylic acids as squalene synthase inhibitors: Syntheses and evaluation
作者:Wang Shen、David S. Garvey、Jerry Cohen、Herman Stein、Saul H. Rosenberg
DOI:10.1016/s0960-894x(98)00143-7
日期:1998.4
Based on earlier lead squalenesynthaseinhibitor A-87049 (3) and zaragozicacids, a series of cyclopentanedi- and tricarboxylic acids were synthesized and evaluated against the enzyme. Some exhibited good potency and SAR revealed the importance of conformation and substitution pattern of these synthetic inhibitors.
Chemistry of Proximal π-Bond Systems. Part I. Synthesis of Vicinal Exocyclic Dimethylene Hydrocarbons
作者:D. N. Butler、R. A. Snow
DOI:10.1139/v72-124
日期:1972.3.15
Thirteen new bi- or polycyclic vicinal exocyclic dimethylene hydrocarbons (10–22) have been synthesized and some of their spectral properties recorded. The generally most useful synthetic route to such compounds utilizes base-catalyzed double elimination from trans-1,2-bis(hydroxymethyl)alkyl p-toluenesulfonates as the final step in the production of the conjugated diene.
Ring-Rearrangement Metathesis (RRM) Mediated by Ruthenium-Indenylidene Complexes
作者:Hervé Clavier、Julie Broggi、Steven P. Nolan
DOI:10.1002/ejoc.200901316
日期:2010.2
Several ruthenium-indenylidenecomplexes bearing N-heterocyclic carbenes (NHCs) and phosphanes have been investigated for the ring rearrangement of cyclic compounds by alkene metathesis. These catalysts were found to promote efficiently such domino reactions, especially sterically hindered NHC-containing complexes. Moreover, indenylidene-type catalysts were compared to benzylidene- and Hoveyda-type
A new and mild access to N-functionalized formamido and thioformamido compounds using hypervalent silicon hydrides
作者:Robert J.P. Corriu、Gérard F. Lanneau、Myriam Perrot-Petta、Vinal Deep Nehta
DOI:10.1016/0040-4039(90)80131-5
日期:1990.1
Hydrosilylation of isocyanates and isothiocyanates is achieved easily using hypervalent difunctional organosilanes. Treatment off the adducts thus obtained through one pot addition of electrophiles gives highly functionalized formamides and N-acylthioformamides.
Well-defined redox-active polymers and block copolymers prepared by living ring-opening metathesis polymerization
作者:D. Albagli、G. Bazan、M. S. Wrighton、R. R. Schrock
DOI:10.1021/ja00037a017
日期:1992.5
ferrocene (2) or phenothiazine (3), were prepared and polymerized by 1a or 1b to give living block copolymers containing the ring-opened norborene derivatives. The livingpolymer was cleaved from the metal in a Wittig-like reaction with pivaldehyde, trimethylsilylbenzaldehyde, or octamethylferrocenecarboxaldehyde. Polydispersities for the longer block copolymers containing up to approximately}90 monomer units
Mo(CH-t-Bu)(NAr)(Ot-Bu)sub 2} (1a) in Thf/0.1 M [n-Busub 4}N]AsFsub 6} 在电位高达1.0 V 并在 Pt 电极上在 -2.16 V vs SCE 处发生可逆的一个电子还原。可以通过用乙烯基二茂铁处理1a来合成含有二茂铁基亚甲基配体(1b)的类似引发剂。含有二茂铁 (2) 或吩噻嗪 (3) 的降冰片烯的氧化还原活性衍生物通过 1a 或 1b 制备和聚合,得到含有开环降冰片烯衍生物的活性嵌段共聚物。在与新戊醛、三甲基甲硅烷基苯甲醛或八甲基二茂铁甲醛的类维蒂希反应中,活性聚合物从金属上裂解下来。通过 GPC,发现含有多达 大约}90 个单体单元的较长嵌段共聚物的多分散性低至 1.05。在一种情况下,由含二茂铁单体制成的均聚物的多分散性通过 FD 质谱测定为 1.06。DSC 研究表明,均聚物和嵌段共聚物的微相研究表明氧