Intramolecular N–Me and N–H aminoetherification for the synthesis of <i>N</i>-unprotected 3-amino-O-heterocycles
作者:Mahesh P. Paudyal、Mingliang Wang、Juha H. Siitonen、Yimin Hu、Muhammed Yousufuddin、Hong C. Shen、John R. Falck、László Kürti
DOI:10.1039/d0ob02122a
日期:——
A mild Rh-catalyzed method for synthesis of cyclic unprotected N–Me and N–H 2,3-aminoethers using an olefin aziridination–aziridine ring-opening domino reaction has been developed. The method is readily applicable to the stereocontrolled synthesis of a variety of 2,3-disubstituted aminoether O-heterocyclic scaffolds, including tetrahydrofurans, tetrahydropyrans and chromanes.
Radical Heterocyclization and Heterocyclization Cascades Triggered by Electron Transfer to Amide-Type Carbonyl Compounds
作者:Huan-Ming Huang、David J. Procter
DOI:10.1002/anie.201708354
日期:2017.11.6
Radical heterocyclizations triggered by electron transfer to amide‐type carbonyls, using SmI2‐H2O, provide straightforward access to bicyclic heterocyclic scaffolds containing bridgehead nitrogen centers. Furthermore, the first radical heterocyclization cascade triggered by reduction of amide‐type carbonyls delivers novel, complex tetracyclic architectures containing five contiguous stereocenters with
Alkene Dioxygenation with Malonoyl Peroxides: Synthesis of γ-Lactones, Isobenzofuranones, and Tetrahydrofurans
作者:Carla Alamillo-Ferrer、Marianna Karabourniotis-Sotti、Alan R. Kennedy、Matthew Campbell、Nicholas C. O. Tomkinson
DOI:10.1021/acs.orglett.6b01253
日期:2016.7.1
homoallylic alcohols or carboxylic acids with malonoyl peroxide 1 provides a stereoselective method for the preparation of tetrahydrofurans, γ-lactones, and isobenzofuranones in 44–82% yield and up to 27:1 trans selectivity. Application of this simple and effective heterocyclization in the synthesis of the antidepressant citalopram is also described.
Reductive cyclisations of amidines involving aminal radicals
作者:Huan-Ming Huang、Ralph W. Adams、David J. Procter
DOI:10.1039/c8cc05178j
日期:——
Amidines bearing simple alkenes undergo aminal radicalcyclisation upon treatment with SmI2. The mild, reductive electron transfer process delivers medicinally-relevant, polycyclic quinazolinone derivatives in good to excellent yield and typically with complete diastereocontrol.
Asymmetric 5-endo chloroetherification of homoallylic alcohols toward the synthesis of chiral β-chlorotetrahydrofurans
作者:Xianghua Zeng、Chengxia Miao、Shoufeng Wang、Chungu Xia、Wei Sun
DOI:10.1039/c2cc38436a
日期:——
An asymmetric 5-endo chloroetherification of homoallylic alcohols is successfully developed that employs an easily available quaternary ammonium salt derived from cinchonine as a conventional organocatalyst. This approach provides ready access to beta-chlorotetrahydrofurans in high enantioselectivities.