A new simple synthesis of variously substituted furans and butenolides
作者:Renji Okazaki、Yoshio Negishi、Naoki Inamoto
DOI:10.1039/c39820001055
日期:——
The reaction of 1,2-disubstituted 3,3-bis(methylthio)prop-2-en-1-ones with dimethylsulphonium methylide gave 2,2-bis[methylthio]-2,5-dihydrofurans, useful synthons for a variety of furans and butenolides.
Cyclobutenones 1 which are readily prepared from alkynes and keteniminium salts 2 were-regiospecifically converted into Δα,β butenolides 4 or cyclopentenones 7. Reaction of 4 with diisobutylaluminum hydride yielded the corresponding substituted furans.
In the presence of a Cu(I) catalyst and a pyridine oxide, alkynyl oxiranes and oxetanes can be converted into functionalized five- or six-membered α,β-unsaturated lactones or dihydrofuranaldehydes. This new oxidative cyclization is proposed to proceed via an unusual allenyloxypyridinium intermediate.
Electronic complementarity permits hindered butenolide heterodimerization and discovery of novel cGAS/STING pathway antagonists
作者:Benjamin J. Huffman、Shuming Chen、J. Luca Schwarz、R. Erik Plata、Emily N. Chin、Luke L. Lairson、K. N. Houk、Ryan A. Shenvi
DOI:10.1038/s41557-019-0413-8
日期:2020.3
biaryl substructures that overpopulate synthetic libraries. Few methods are available that can link fully substitutedcarbon atoms of tworings with stereocontrol. Here we have developed a stereoselective, heteroselective butenolide coupling that exhibits an unusually fast rate of C-C bond formation driven by exquisite complementarity of the reacting π systems. Heterodimerization generates a compound
Gold-Catalyzed Cascade Oxidative Cyclization and Arylation of Allenoates
作者:Rui Zhang、Qin Xu、Kai Chen、Peng Gu、Min Shi
DOI:10.1002/ejoc.201300896
日期:2013.11
was found to be effective for the cascadeoxidativearylation and cyclization of allenoates with arylboronic acids to give the corresponding cyclic adducts in moderate yields. This reaction system constitutes a new method for the synthesis of β-aryl-γ-butenolides under mild conditions. Based on the previous mechanistic studies, a proposed AuI/AuIII redox catalytic cycle has been outlined.