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
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.
Radical Anions from Urea-type Carbonyls: Radical Cyclizations and Cyclization Cascades
作者:Huan-Ming Huang、Joseph J. W. McDouall、David J. Procter
DOI:10.1002/anie.201800667
日期:2018.4.23
carbonyls by reductive electron transfer are exploited in carbon–carbon bond formation. New radical cyclizations of urea radical anions deliver complexnitrogenheterocycles and, depending upon the proton source used in the reactions, a chemoselective switch between reaction pathways can deliver two heterobicyclic scaffolds. A computational study has been used to investigate the selectivity of the urea