A novel and efficient synthetic approach to substituted 2-iodo-spiro[indene-1,1'-isobenzofuran]-3'-ones has been developed via an iodine-promoted cascade cyclization of 2-(3-hydroxy-3,3-diarylprop-1-yn-1-yl)benzoates. This sequential cascade process is concisely conducted at room temperature. Subsequent palladium-catalyzed Sonogashira, Suzuki, and Heck reactions of the resulting iodides proceed smoothly
Selective Oxidation of Sulfides to Sulfoxides Using IBX-Esters
作者:Viktor Zhdankin、Alexey Koposov
DOI:10.1055/s-2004-834873
日期:——
IBX-esters (esters of 2-iodoxybenzoic acid) are convenient hypervalent iodine reagents for the clean and selective oxidation of organic sulfides to sulfoxides. This reaction proceeds without over-oxidation to sulfones andis compatible with the presence of the hydroxy group, double bond, phenolether, benzylic carbon, and various substituted phenyl rings in the molecule of the substrate.
K2S2O8-promoted [2+2]-cycloaddition of benzyl-2-(3-hydroxypropynyl)-benzoates: A new route to polysubstituted cyclobutanes
作者:Hai-Tao Zhu、Xiao-Juan Tong、Ni-Ni Zhou、De-Suo Yang、Ming-Jin Fan
DOI:10.1016/j.tetlet.2016.10.098
日期:2016.12
An efficient and convenient metal-free [2+2]-cycloaddition of benzyl-2-(3-hydroxypropynyl)-benzoates via allene processes has been developed, which provides impressive access to fused cyclobutanes from easily accessed π-components. This transformation involved the cleavage of two C–O bonds, the formations of two C–O bonds and two C–C bonds and showed some advantages, including mild conditions and wide
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
Oxovanadium(V)-Induced Cross-Coupling Reaction between Two Ligands of Organozinc Compounds
作者:Toshikazu Hirao、Takashi Takada、Akiya Ogawa
DOI:10.1021/jo9919106
日期:2000.3.1
Oxovanadium(V) compounds such as VO(OEt)Cl(2) serve as useful oxidants for organozinc compounds, providing the corresponding cross-coupling products derived from two ligands of organozinc compounds. In particular, triorganozincates undergo selective cross-coupling smoothly by the action of oxovanadium(V).