Asymmetric cycloadditions of o-quinone methides employing chiral ammonium fluoride precatalysts.

Asymmetric cycloadditions of o-quinone methides employing chiral ammonium fluoride precatalysts.
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DOI:
10.1021/ol802029e
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发表时间:
2008-11-06
期刊:
影响因子:
5.2
通讯作者:
Lectka T
Lectka T
中科院分区:
化学1区
文献类型:
--
作者:
Alden-Danforth E;Scerba MT;Lectka T

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The catalytic, enantioselective, [4 + 2] cycloaddition reaction of ortho-quinone methides with silyl ketene acetals is described. This mechanistically interesting reaction, initiated by a chiral cinchona alkaloid-derived ammonium fluoride “precatalyst” complex, affords a variety of alkyl- and aryl-substituted 3,4-dihydrocoumarin products in excellent yield and with good enantioselectivity.
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