Metal-Free Asymmetric Synthesis of Indanes through Chiral Hypervalent Iodine(III)-Mediated Ring Contraction
作者:Anees Ahmad、Luiz F. Silva
DOI:10.1021/acs.joc.5b02803
日期:2016.3.4
The iodine(III)-mediated asymmetric oxidative rearrangement of 1,2-dihydronaphthalenes was investigated to prepare optically active 1-substituted indanes. The chiral hypervalent iodine species is generated in situ from a chiral aryl iodide, prepared in 94% yield in one step. This metal-free protocol was applied to different cyclic alkenes, substituted with oxygen, with nitrogen, or at position 1 with
Chiral hypervalent iodine-catalyzed enantioselective oxidative Kita spirolactonization of 1-naphthol derivatives and one-pot diastereo-selective oxidation to epoxyspirolactones
作者:Muhammet Uyanik、Takeshi Yasui、Kazuaki Ishihara
DOI:10.1016/j.tet.2010.04.060
日期:2010.7
hydrogen-bonding interactions as a chiral catalyst for the enantioselectiveKitaoxidativespirolactonization of 1-naphthol derivatives 5. Iodosylarenes 8 were generated in situ from iodoarenes 7 and mCPBA as a co-oxidant. Furthermore, epoxyspirolactone 15 was obtained by the one-pot oxidation of 5 with mCBPA in the presence of 7g. Thus, the enantioselectiveoxidation of 5 to 6 and the successive enantio-
HPLC separation of 2-aryloxycarboxylic acid enantiomers on chiral stationary phases
作者:A. A. Tumashov、S. A. Vakarov、L. Sh. Sadretdinova、E. N. Chulakov、G. L. Levit、V. P. Krasnov、V. N. Charushin
DOI:10.1007/s11172-021-3165-8
日期:2021.5
reversed-phase HPLC on popular chiralstationaryphases. The best separation parameters were achieved on the chiralphases with the polysaccharide base Chiralcel OD-H and Chiralpack AD under the normal-phase HPLC conditions. The (S)- and (R)-enantiomers of 2-(1-naphthyloxy)- and 2-(2-iodophenoxy)propionic acids with enantiomeric excess ee >99% were isolated using preparative chiralHPLC.
Enantioselective Oxidation of Alkenylbenzoates Catalyzed by Chiral Hypervalent Iodine(III) To Yield 4-Hydroxyisochroman-1-ones
作者:Mio Shimogaki、Morifumi Fujita、Takashi Sugimura
DOI:10.1002/ejoc.201300959
日期:2013.11
oxylactonization of ortho-alk-1-enylbenzoates with chiralhypervalentiodine(III) reagents yielded 3-alkyl-4-hydroxyisochroman-1-ones with high enantiomeric purity (ca. 90 % ee). The enantioselective oxidation was also performed under catalytic conditions, in which a catalytic amount (10 mol-%) of a chiral iodoarene was oxidized to the hypervalentiodine species in situ using a stoichiometric co-oxidant
Enantiodifferentiating tetrahydrofuranylation of but-3-enyl carboxylates using optically active hypervalent iodine(III) reagents via a 1,3-dioxan-2-yl cation intermediate
作者:Morifumi Fujita、Sakuro Okuno、Hee Jin Lee、Takashi Sugimura、Tadashi Okuyama
DOI:10.1016/j.tetlet.2007.10.015
日期:2007.12
Optically active methyl 2-[2-(diacetoxyiodo)phenoxy]propanoate and its derivative were prepared and used for oxygenation of but-3-enyl carboxylates leading to tetrahydrofuran-3-yl carboxylates as an enantiomerically enriched form. (c) 2007 Elsevier Ltd. All rights reserved.