Einhorn; Hollandt, Justus Liebigs Annalen der Chemie, 1898, vol. 301, p. 104
作者:Einhorn、Hollandt
DOI:——
日期:——
Asymmetric Cycloadditions of <i>o</i>-Quinone Methides Employing Chiral Ammonium Fluoride Precatalysts
作者:Ethan Alden-Danforth、Michael T. Scerba、Thomas Lectka
DOI:10.1021/ol802029e
日期:2008.11.6
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.