Cyanoesterification of norbornenes catalyzed by palladium: facile synthetic methodology to introduce cyano and ester functionalities via direct carbon–carbon bond cleavage of cyanoformates
Addition of cyanoformates (NC–COOR) to norbornene at 110 °C in the presence of Pd(PPh3)4 (10 mol %) as a catalyst affords with high selectivity the corresponding doubly functionalized polar norbornane derivatives bearing both cyano and ester groups. By using benzonorbornadiene and norbornadienes as the substrates, the reaction can be extended to synthesis of various functionalized norbornene derivatives
Synthesis, Structure, and Isomerization of Alkoxycarbonyl(chloro)(cyano)rhodium(III) Complexes, <i>mer</i>-[RhCl(CO<sub>2</sub>R)(CN)(PMe<sub>3</sub>)<sub>3</sub>] (R = Me, Et, <i><sup>n</sup></i>Pr, <i><sup>i</sup></i>Pr, <i><sup>n</sup></i>Bu, and Bn), through C–C Bond Cleavage of Cyanoformates
Alkoxycarbonyl(chloro)(cyano)rhodium(III) complexes mer-[RhCl(CO2R)(CN)(PMe3)3] (1: R = Me; 2: R = Et; 3: R = nPr; 4: R = iPr; 5: R = nBu; 6: R = Bn) are prepared via oxidative addition of the corresponding cyanoformates to [RhCl(PMe3)3], derived in situ from [RhCl(cod)]2 and three equivalents of PMe3 in toluene at 70 °C, and their structures are characterized using NMR (1H, 13C1H}, and 31P1H}) and X-ray diffraction.
烷氧基碳酰基(氯)(氰)铑(III)配合物 mer-[RhCl(CO2R)(CN)(PMe3)3](1: R = Me; 2: R = Et; 3: R = nPr; 4: R = iPr; 5: R = nBu; 6: R = Bn)通过将相应的氰基甲酸酯氧化加成到 [RhCl(PMe3)3] 制备而成,后者是在70 °C下由 [RhCl(cod)]2 和三等摩尔的 PMe3 在甲苯中原位生成的,并通过 NMR(1H, 13C1H}, 和 31P1H})及 X 射线衍射对其结构进行了表征。
Regioselective syntheses of 2-amino-4,5-dialkylthiophene-3-carboxylates and their conversion to 3,4-dihydro-4-oxothieno[2,3-<i>d</i>]pyrimidine-2-carboxylates
作者:Gary D. Madding、Michael D. Thompson
DOI:10.1002/jhet.5570240309
日期:1987.5
The synthesis of 3,4-dihydro-4-oxothieno[2,3-d]pyrimidine-2-carboxylates via acid catalyzed reactions of various 2-aminothiophene-3-carboxylates with activated nitriles is presented. The requisite thiophenes were prepared regioselectively by methods which represent improvements over previously published procedures.
提出了通过各种2-氨基噻吩-3-羧酸酯与活化腈的酸催化反应合成3,4-二氢-4-氧杂噻吩并[2,3- d ]嘧啶-2-羧酸酯。通过代表对先前公开的方法的改进的方法,选择性地制备必需的噻吩。
Synthesis of Functionalized Isoindoles by the Rhodium-Catalyzed Reaction of Cyanoformates with ortho-Borylbenzalacetone Derivatives
Iminoisobenzofuran derivatives have been prepared in moderate yields by the palladium-catalyzed three-component coupling reaction of arynes, isocyanides, and cyanoformates. This paper is dedicated to Professor Ei-ichi Negishi on the occasion of his 77th birthday.