You are seeing Ask web results for cinchona bases because there was not a match on Dictionary.com.
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Next, the influence of modifications on the natural cinchona bases ... Modified cinchona bases screened for the aza-Henry reaction using imines 1a–c. ...
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It is known that quaternary ammonium salts derived from cinchona bases suffer base-induced alterations under PTC conditions. In order to maintain their ...
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are shown in Scheme 2 (A and B). The hetero-cinchona bases were formulated previously as 9 by Rabe,[6] one of the pioneers of cinchona alkaloid chemistry. ...
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Apr 30, 2004 ... widening perspectives in the chemistry of Cinchona bases, embracing both basic and applied science. The alkaloids en- ...
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We report here unprecedented enantioselectivities for metal-free decarboxylative protonations carried out in the presence of urea/thiourea cinchona bases ...
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May 12, 2009 ... One aspect of the present invention relates to cinchona-alkaloid-based catalysts. A second aspect of the invention relates to a method of ...
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A compound of formula (I) ##STR1## its tautomeric forms, its stereoisomers, its polymorphs, its pharmaceutically acceptable salts or its pharmaceutically acceptable solvates, wherein R 3 , R ... R7 represents hydrogen atom, hydroxy, alkoxy, halogen, lower alkyl group or ... B represents an oxygen atom or a sulfur atom;
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tory cinchona alkaloids and negative to d-isomers. In another ... optically i,omeric cinchona alkaloids and some related bases by quinine-sensitive subjects ...
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but, as will be recognized by those skilled in the art, reaction conditions using bases of these types must be designed to avoid excessive irreversible reaction of the base with 4-chloroquinoline or a substituted 4-chloroquinoline.
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A polymer-supported Cinchona-based bifunctional sulfonamide catalyst: a highly enantioselective, recyclable heterogeneous organocatalyst; ... The design, synthesis, and catalytic application of a highly enantioselective and indefinitely stable polymer-supported Cinchona-based bifunctional sulfonamide is reported.
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