Synthesis of Isocoumarins and α-Pyrones via Palladium-Catalyzed Annulation of Internal Alkynes
作者:Richard C. Larock、Mark J. Doty、Xiaojun Han
DOI:10.1021/jo9821628
日期:1999.11.1
factors. A number of 3,4-disubstituted isocoumarins and polysubstituted alpha-pyrones have been prepared in good yields by treating halogen- or triflate-containing aromatic and alpha,beta-unsaturated esters, respectively, with internalalkynes in the presence of a palladium catalyst. Synthetically, the methodology provides an especially simple and convenient regioselective route to isocoumarins and alpha-pyrones
作者:Craig G. Bates、Pranorm Saejueng、Michael Q. Doherty、D. Venkataraman
DOI:10.1021/ol0477935
日期:2004.12.1
[reaction: see text] We report a method for the synthesis of vinyl sulfides using the soluble copper(I) catalyst [Cu(phen)(PPh3)2]NO3. The desired vinyl sulfides are obtained in good to excellent yields, with retention of stereochemistry. This protocol tolerates a wide variety of functional groups or substrates, is palladium-free, and does not require the use of expensive or air-sensitive additives
α-(<i>N</i>-Carbamoyl)alkylcuprate Chemistry in the Synthesis of Nitrogen Heterocycles
作者:R. Karl Dieter、Kai Lu
DOI:10.1021/jo016053w
日期:2002.2.1
beta-ynoates, alpha-allenyl esters, or alpha.beta-enoates or enimides undergo N-Boc deprotection and cyclization onto the ester functionality upon treatment with PhOH/TMSCl, catecholboron bromide, or trimethylsilyl triflate. This two-pot sequence provides synthetic routes to 4-alkylidinepyrrolidine-2-ones, 4-alkylidinepyrrolizidin-2-ones, and 4-alkylidineindolizidin-2-ones via allenylesters; pyrrolin-2-ones
Ligand Effects on the Pd-Catalyzed Cross-Coupling Reaction of 3-Iodoalk-2-enoates with Propargyl/1,2-Allenylic Metallic Species: An Efficient Regiodivergent Synthesis of 2,4,5-Trienoates
作者:Jinbo Zhao、Yihua Yu、Shengming Ma
DOI:10.1002/chem.200901287
日期:2010.1.4
makes a big difference: The 1,3‐lithiumshift of propargyl/1,2‐allenyl lithium has been tuned and applied in a subsequenttransmetalation and Pd‐catalyzed Negishi couplingreaction with 3‐iodoalk‐2‐enoates to give a highly regioselective and regiodivergent synthesis of 2,4,5‐trienoates. It was discovered that ligands play a very important role in the cross‐couplingreactions with respect to both regioselectivity
Assembly of fused indenesvia Au(<scp>i</scp>)-catalyzed C1–C5 cyclization of enediynes bearing an internal nucleophile
作者:Qiwen Hou、Zhenhua Zhang、Fanji Kong、Shaozhong Wang、Huaqin Wang、Zhu-Jun Yao
DOI:10.1039/c2cc36245g
日期:——
enediynes bearing an internal carboxy nucleophile has been developed, providing a distinctive methodology for the assembly of fused indenes including indeno[1,2-c]isochromen-5(11H)-ones and indeno[1,2-b]pyran-2(5H)-ones. A mechanism involving the concerted formation of the five- and six-membered rings was proposed.