Abstract A series of planar chiral iodoarenes based on [2.2]paracyclophane was synthesized. An efficient asymmetric intramolecular oxidativelactonization of naphthols enabled by a combination of these chiral iodoarenes and mCPBA as oxidant is reported. This reaction proceeds under mild conditions, allowing the formation of spirolactones bearing a tetrasubstituted stereocenter in moderate yields and
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-
Chiral Hypervalent Organoiodine-Catalyzed Enantioselective Oxidative Spirolactonization of Naphthol Derivatives
作者:Muhammet Uyanik、Takeshi Yasui、Kazuaki Ishihara
DOI:10.1021/acs.joc.7b01941
日期:2017.11.17
Highly enantioselective oxidative dearomatization of 2-naphthol derivatives was achieved for the first time by using conformationallyflexible organoiodine catalysts derived from 2-aminoalcohol as a chiral source. Moreover, with the use of these catalysts, excellent enantioselectivities were also achieved for 1-naphthol derivatives, which had previously been obtained with only lower enantioselectivities
A highly efficient and practical oxidative dearomatization of phenols using sodium hypochlorite pentahydrate as an inexpensive, strong oxidant is reported for the first time. The oxidation reactions proceeded very rapidly in the presence of water to give the desired products in excellent yields, and sodium chloride and water were the only by-products derived from the oxidant.
IODOARENE DERIVATIVE, METHOD FOR PRODUCING OPTICALLY ACTIVE SPIROLACTONE COMPOUND USING SAME, AND METHOD FOR PRODUCING OPTICALLY ACTIVE CYCLIZATION ADDUCT
申请人:National University Corporation Nagoya University