Enantioselective aza-Friedel-Crafts reaction of furan with α-ketimino esters induced by a conjugated double hydrogen bond network of chiral bis(phosphoric acid) catalysts.
Enantioselective aza-Friedel-Crafts reaction of furan with α-ketimino esters induced by a conjugated double hydrogen bond network of chiral bis(phosphoric acid) catalysts.
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DOI:
10.1039/c8sc02290a
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发表时间:
2018-08-14
期刊:
影响因子:
8.4
通讯作者:
Ishihara K
中科院分区:
文献类型:
--
作者:
Hatano M;Okamoto H;Kawakami T;Toh K;Nakatsuji H;Sakakura A;Ishihara K
Chiral C2- and C1-symmetric BINOL-derived bis(phosphoric acid) catalysts facilitated the enantioselective aza-Friedel–Crafts reaction of 2-methoxyfuran with α-ketimino esters. Chiral C2- and C1-symmetric BINOL-derived bis(phosphoric acid) catalysts, which have OP(O)(OH)2/OP(O)(OH)(OR) moieties at the 2,2′-positions, were developed and used for the enantioselective aza-Friedel–Crafts reaction of 2-methoxyfuran with α-ketimino esters for the first time. The intramolecular conjugated double hydrogen bond network is a key to increasing the Brønsted acidity and preventing deactivation of the catalysts. Highly functionalized α-amino acid derivatives with a chiral quaternary carbon center could be transformed into versatile optically active N- and O-heterocycles and an α-aryl-substituted serine.
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