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DOI: 10.1055/s-0029-1218699
Cinchona Alkaloids in Asymmetric Organocatalysis
Publication History
Publication Date:
12 March 2010 (online)
Abstract
This article reviews the applications of cinchona alkaloids as asymmetric catalysts. In the last few years, characterized by the resurgence of interest in asymmetric organocatalysis, cinchona derivatives have been shown to catalyze an outstanding array of chemical reactions, often with remarkable stereoselectivity. This work presents an overview of the transformations developed in the period from 2001 through 2009, highlighting applications in the synthesis of bioactive molecules and natural products.
1 Introduction
2 Additions to Carbonyls
3 Additions to Imines
4 Conjugate Additions
5 Additions to Olefins
6 Nucleophilic Substitutions
7 Electrophilic Halogenations
8 Opening of Cyclic Anhydrides
9 Acylations
10 Cycloadditions
11 Rearrangements
12 Decarboxylations
13 Miscellaneous
14 Conclusions and Outlook
List of abbreviations: Alloc, allyloxycarbonyl; Boc, tert-butyloxycarbonyl; Bs, benzenesulfonyl; BTTP, tert-butyliminotri(pyrrolidino)phosphorane; Cbz, benzyloxycarbonyl; DABCO, 1,4-diazabicyclo[2.2.2]octane; DBAD, dibenzyl azodicarboxylate; DBU, 1,8-diazabicycloundec-7-ene; DCE, 1,2-dichloroethane; DFT, density functional theory; DIPEA, N,N-diisopropylethylamine; DNP, 2,4-dinitrophenyl; DMB, 3,4-dimethoxybenzoyl; DPM, diphenylmethyl; DTAD, di-tert-butyl azodicarboxylate; EVE, ethyl vinyl ether; EWG, electron-withdrawing group; FBSM, 1-fluorobis(phenylsulfonyl)methane; HFiPA, 1,1,1,3,3,3-hexafluoro-2-propyl acrylate; LAH, lithium aluminum hydride; LG, leaving group; Moc, methyloxycarbonyl; MPEG, poly(ethylene glycol) monomethyl ether; MS, molecular sieves; MVK, methyl vinyl ketone; NFSI, N-fluorobenzenesulfonimide; NMR, nuclear magnetic resonance; Ns, p-nitrophenylsulfonyl; PEG, poly(ethylene glycol); PS, proton sponge [1,8-bis(dimethylamino)naphthalene]; rds, rate-determining step; TBAF, tetrabutylammonium fluoride; TCCA, trichloroisocyanuric acid; TFAA, trifluoroacetic anhydride; THF, tetrahydrofuran; TMAF, tetramethylammonium fluoride; TMS, trimethylsilyl; Ts, p-toluenesulfonyl; UNCA, urethane-protected α-amino acid N-carboxyanhydrides.
Key words
cinchona alkaloids - organocatalysis - asymmetric catalysis - kinetic resolution - stereoselective synthesis
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References
In simpler words: if both quinine and quinidine lacked the C3-vinyl groups, they would be enantiomers.
6Prices from the Sigma-Aldrich website (November 2009, Italy): quinine, 50 g - ı 131.30; quinidine, 50 g - ı 288 40; cinchonidine, 100 g - ı 111.10; cinchonine, 100 g - ı 115.20