期刊
CHIRALITY
卷 24, 期 3, 页码 215-222出版社
WILEY
DOI: 10.1002/chir.21985
关键词
paracyclophane; Bronsted acid; organocatalysis; planar chirality; Friedel-Crafts; Mannich
The synthesis of planar chiral strong Bronsted acid organocatalysts derived from [2.2]paracyclophane is described. Resolution was accomplished according to a modified protocol involving pseudo-ortho-substituted [2.2]paracyclophane-based sulfoxides for the synthesis of three new sulfonic acids. The first planar chiral phosphoric acid diester was obtained from the corresponding phenyl-substituted diol derived from enantiopure 4-bromo-12-hydroxy [2.2]paracyclophane. These new classes of catalysts were tested in an enantioselective FriedelCrafts reaction as well as in a direct asymmetric Mannich reaction and gave yields of up to 93% and ee-values of up to 38%. Chirality, 2012. (C) 2012 Wiley Periodicals, Inc.
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