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
Straightforward Reductive Esterification of Carbonyl Compounds with Carboxylic Acids through Tosylhydrazone Intermediates
作者:Angel-Humberto García-Muñoz、María Tomás-Gamasa、M. Carmen Pérez-Aguilar、Erick Cuevas-Yañez、Carlos Valdés
DOI:10.1002/ejoc.201200647
日期:2012.7
The reaction of carboxylicacids with tosylhydrazones in basic media gives rise to the corresponding esters through an O–H insertion reaction in the in situ generated diazo compound. The process is operationally very simple, catalyst free, and very general with regard to the structure of both coupling partners. In particular, the esterification can be accomplished by employing tosylhydrazones derived
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
Copper-Catalyzed Oxyalkynylation of C–S Bonds in Thiiranes and Thiethanes with Hypervalent Iodine Reagents
作者:Julien Borrel、Guillaume Pisella、Jerome Waser
DOI:10.1021/acs.orglett.9b04157
日期:2020.1.17
We report the oxyalkynylation of thiiranes and thietanes using ethynylbenziodoxolonereagents (EBXs) to readily access functionalized building blocks bearing an alkynyl, a benzoate, and an iodide group. The reaction proceeds with high atom efficiency most likely through an alkynyl-episulfonium intermediate. The transformation is copper-catalyzed and compatible with a large array of thiiranes and thietanes