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Results: 1-25 | 26-37
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Asymmetric synthesis of the northern half C1-C16 of the bryostatins
Authors: Vakalopoulos, A Lampe, TFJ Hoffmann, HMR
Citation: A. Vakalopoulos et al., Asymmetric synthesis of the northern half C1-C16 of the bryostatins, ORG LETT, 3(6), 2001, pp. 929-932
Versatile 8-oxabicyclo[3.2.1]oct-6-en-3-one: Stereoselective methodology for generating c-glycosides, delta-valerolactones, and polyacetate segments
Authors: Vakalopoulos, A Hoffmann, HMR
Citation: A. Vakalopoulos et Hmr. Hoffmann, Versatile 8-oxabicyclo[3.2.1]oct-6-en-3-one: Stereoselective methodology for generating c-glycosides, delta-valerolactones, and polyacetate segments, ORG LETT, 3(2), 2001, pp. 177-180
Chelation, activation, and proximity effects in the deprotection of dithianes with ZnBr2. Applications in the polyketide field
Authors: Vakalopoulos, A Hoffmann, HMR
Citation: A. Vakalopoulos et Hmr. Hoffmann, Chelation, activation, and proximity effects in the deprotection of dithianes with ZnBr2. Applications in the polyketide field, ORG LETT, 3(14), 2001, pp. 2185-2188
Cross-coupling reactions in Cinchona alkaloid chemistry: aryl-substituted and dimeric quinine, quinidine, as well as quincorine and quincoridine derivatives
Authors: Frackenpohl, J Braje, WM Hoffmann, HMR
Citation: J. Frackenpohl et al., Cross-coupling reactions in Cinchona alkaloid chemistry: aryl-substituted and dimeric quinine, quinidine, as well as quincorine and quincoridine derivatives, J CHEM S P1, (1), 2001, pp. 47-65
Crystal structure of (1S,2R,4S,5S)-5-ethynyl-2-hydroxymethy-1-azabicyclo[2.2.2]octane, (HC2)(HOCH2)(C7H11N)
Authors: Wartchow, R Frackenpohl, J Hoffmann, HMR
Citation: R. Wartchow et al., Crystal structure of (1S,2R,4S,5S)-5-ethynyl-2-hydroxymethy-1-azabicyclo[2.2.2]octane, (HC2)(HOCH2)(C7H11N), Z KRIST-NEW, 216(2), 2001, pp. 235-236
The total synthesis of C-glycosides with completely resolved seven-carbon backbone polyol stereochemistry: Stereochemical correlations and access to L-configured and other rare carbohydrates
Authors: Hoffmann, HMR Dunkel, R Mentzel, M Reuter, H Stark, CBW
Citation: Hmr. Hoffmann et al., The total synthesis of C-glycosides with completely resolved seven-carbon backbone polyol stereochemistry: Stereochemical correlations and access to L-configured and other rare carbohydrates, CHEM-EUR J, 7(22), 2001, pp. 4771-4789
High regio-, chemo-, and stereoselectivity via low-temperature 4+3 cycloadditions. Convergent synthesis of multifunctionalized vinylmetals (M = Si, Sn) and S-vinyl benzenecarbothioates
Authors: Beck, H Stark, CBW Hoffmann, HMR
Citation: H. Beck et al., High regio-, chemo-, and stereoselectivity via low-temperature 4+3 cycloadditions. Convergent synthesis of multifunctionalized vinylmetals (M = Si, Sn) and S-vinyl benzenecarbothioates, ORG LETT, 2(7), 2000, pp. 883-886
Synthesis of enantiopure 1-azabicyclo[3.2.2]nonanes via stereoselective capture of chiral carbocations
Authors: Roper, S Frackenpohl, J Schrake, O Wartchow, R Hoffmann, HMR
Citation: S. Roper et al., Synthesis of enantiopure 1-azabicyclo[3.2.2]nonanes via stereoselective capture of chiral carbocations, ORG LETT, 2(12), 2000, pp. 1661-1664
Novel deprotection of SEM ethers: A very mild and selective method using magnesium bromide
Authors: Vakalopoulos, A Hoffmann, HMR
Citation: A. Vakalopoulos et Hmr. Hoffmann, Novel deprotection of SEM ethers: A very mild and selective method using magnesium bromide, ORG LETT, 2(10), 2000, pp. 1447-1450
Synthesis of the C38-C44 segment of altohyrtin A - With an addendum on thepreparation of 8-oxabicyclo[3.2.1]oct-6-en-3-one
Authors: Kim, H Hoffmann, HMR
Citation: H. Kim et Hmr. Hoffmann, Synthesis of the C38-C44 segment of altohyrtin A - With an addendum on thepreparation of 8-oxabicyclo[3.2.1]oct-6-en-3-one, EUR J ORG C, (12), 2000, pp. 2195-2201
Structure and mechanism in Cinchona alkaloid chemistry: Aqueous hydrolysisproceeds with complete inversion or complete retention of configuration (vol 39, pg 2085, 2000)
Authors: Hoffmann, HMR
Citation: Hmr. Hoffmann, Structure and mechanism in Cinchona alkaloid chemistry: Aqueous hydrolysisproceeds with complete inversion or complete retention of configuration (vol 39, pg 2085, 2000), ANGEW CHEM, 39(16), 2000, pp. 2808-2808
Structure and mechanism in Cinchona alkaloid chemistry: Aqueous hydrolysisproceeds with complete inversion or complete retention of configuration
Authors: Braje, WM Holzgrefe, J Wartchow, R Hoffmann, HMR
Citation: Wm. Braje et al., Structure and mechanism in Cinchona alkaloid chemistry: Aqueous hydrolysisproceeds with complete inversion or complete retention of configuration, ANGEW CHEM, 39(12), 2000, pp. 2085
Crystal structure of (1S,2R,4S)-2-bromomethyl-1-azabicyclo[2.2.2]-octan-5-one, C8H12BrNO
Authors: Wartchow, R Frackenpohl, J Hoffmann, HMR
Citation: R. Wartchow et al., Crystal structure of (1S,2R,4S)-2-bromomethyl-1-azabicyclo[2.2.2]-octan-5-one, C8H12BrNO, Z KRIST-NEW, 215(3), 2000, pp. 435-436
Crystal structure of (1S,2R,5R,6R)-2-methoxy-6-(16-nitrophenylethynyl)-1-azabicyclo[3.2.2]nonane, C17H20N2O3
Authors: Frackenpohl, J Roper, S Hoffmann, HMR Wartchow, R
Citation: J. Frackenpohl et al., Crystal structure of (1S,2R,5R,6R)-2-methoxy-6-(16-nitrophenylethynyl)-1-azabicyclo[3.2.2]nonane, C17H20N2O3, Z KRIST-NEW, 215(3), 2000, pp. 437-438
Crystal structure of 1,8-dimethyl-7 alpha-methoxy-10 alpha-(triisopropylsilyloxy)-(2 beta)-12-oxatricyclo[6.3.1.0(2,7)]dodecane-3 beta,4 alpha-diol, [(C3H7)(3)SiO](CH3)(2)(OH)(2)(OCH3)(C11H12O)
Authors: Wittenberg, J Hoffmann, HMR Wartchow, R
Citation: J. Wittenberg et al., Crystal structure of 1,8-dimethyl-7 alpha-methoxy-10 alpha-(triisopropylsilyloxy)-(2 beta)-12-oxatricyclo[6.3.1.0(2,7)]dodecane-3 beta,4 alpha-diol, [(C3H7)(3)SiO](CH3)(2)(OH)(2)(OCH3)(C11H12O), Z KRIST-NEW, 215(1), 2000, pp. 153-154
Chiral allyl cations are captured by furan with 100 % stereoselectivity: Synthesis of enantiopure 2-alkoxy-8-oxabicyclo[3.2.1]oct-6-en-3-ones by low-temperature [4+3] cycloaddition
Authors: Stark, CBW Pierau, S Wartchow, R Hoffmann, HMR
Citation: Cbw. Stark et al., Chiral allyl cations are captured by furan with 100 % stereoselectivity: Synthesis of enantiopure 2-alkoxy-8-oxabicyclo[3.2.1]oct-6-en-3-ones by low-temperature [4+3] cycloaddition, CHEM-EUR J, 6(4), 2000, pp. 684-691
High stereochemical diversity and applications for the synthesis of marinenatural products: A library of carbohydrate mimics and polyketide segments
Authors: Misske, AM Hoffmann, HMR
Citation: Am. Misske et Hmr. Hoffmann, High stereochemical diversity and applications for the synthesis of marinenatural products: A library of carbohydrate mimics and polyketide segments, CHEM-EUR J, 6(18), 2000, pp. 3313-3320
Stereocontrolled synthesis of heteroannular acetals from functionalized 1,5-enynes via radical cascades - Construction of quaternary and 1,2-diquaternary centres in polycyclic systems
Authors: Rhode, O Hoffmann, HMR
Citation: O. Rhode et Hmr. Hoffmann, Stereocontrolled synthesis of heteroannular acetals from functionalized 1,5-enynes via radical cascades - Construction of quaternary and 1,2-diquaternary centres in polycyclic systems, TETRAHEDRON, 56(35), 2000, pp. 6479-6488
Recalcitrant S(N)2 displacements at carbon C9 of quincorine and quincoridine: 1,2-amino halides and mesylates with configurationally rigid nitrogen
Authors: Schrake, O Franz, MH Wartchow, R Hoffmann, HMR
Citation: O. Schrake et al., Recalcitrant S(N)2 displacements at carbon C9 of quincorine and quincoridine: 1,2-amino halides and mesylates with configurationally rigid nitrogen, TETRAHEDRON, 56(26), 2000, pp. 4453-4465
Synthesis of enantiopure 3-quinuclidinone analogues with three stereogeniccenters: (1S,2R,4S)- and (1S,2S,4S)-2-(hydroxymethyl)-1-azabicyclo[2.2.2]octan-5-one and stereocontrol of nucleophilic addition to the carbonyl group
Authors: Frackenpohl, J Hoffmann, HMR
Citation: J. Frackenpohl et Hmr. Hoffmann, Synthesis of enantiopure 3-quinuclidinone analogues with three stereogeniccenters: (1S,2R,4S)- and (1S,2S,4S)-2-(hydroxymethyl)-1-azabicyclo[2.2.2]octan-5-one and stereocontrol of nucleophilic addition to the carbonyl group, J ORG CHEM, 65(13), 2000, pp. 3982-3996
Synthesis of 10,11-didehydro Cinchona alkaloids and key derivatives
Authors: Braje, WM Frackenpohl, J Schrake, O Wartchow, R Beil, W Hoffmann, HMR
Citation: Wm. Braje et al., Synthesis of 10,11-didehydro Cinchona alkaloids and key derivatives, HELV CHIM A, 83(4), 2000, pp. 777-792
Novel bridged bicyclic alpha-amino acid eaters and key derivatives from quincorine and quincoridine
Authors: Schrake, O Rahn, VS Frackenpohl, J Braje, WM Hoffmann, HMR
Citation: O. Schrake et al., Novel bridged bicyclic alpha-amino acid eaters and key derivatives from quincorine and quincoridine, ORG LETT, 1(10), 1999, pp. 1607-1610
Asymmetric synthesis of the C1-C16 segment of lasonolide A
Authors: Beck, H Hoffmann, HMR
Citation: H. Beck et Hmr. Hoffmann, Asymmetric synthesis of the C1-C16 segment of lasonolide A, EUR J ORG C, (11), 1999, pp. 2991-2995
Structure and mechanism in cinchona alkaloid chemistry: Overturning a 50-year-old misconception
Authors: Braje, WM Wartchow, R Hoffmann, HMR
Citation: Wm. Braje et al., Structure and mechanism in cinchona alkaloid chemistry: Overturning a 50-year-old misconception, ANGEW CHEM, 38(17), 1999, pp. 2540-2543
Crystal structure of (1S,2S,4S,5R)-2-hydroxymethyl-5-ethynyl-1-azabicyclo[2,2,2]octane, (HOCH2)(HC2)(C7H11N)
Authors: Wartchow, R Schrake, O Braje, WM Hoffmann, HMR
Citation: R. Wartchow et al., Crystal structure of (1S,2S,4S,5R)-2-hydroxymethyl-5-ethynyl-1-azabicyclo[2,2,2]octane, (HOCH2)(HC2)(C7H11N), Z KRIST-NEW, 214(2), 1999, pp. 285-286
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