126
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Bouwman E, Evans P, de Graaff RAG, Kooijman H, Poinsot R, Rabu P, Reedijk J, Spek AL. Synthesis and Spectroscopy of Coordination Compounds of a Versatile Bridging Ligand. Molecular Structures of the Dinuclear Compounds [Co2(bdnol)(NCS)3], [Zn2(bdnol)Cl(NCS)2], and [Cu2(bdnol)(NO3)3] and of the Polymeric Copper(I) Compound [Cu2(Hbdnol)(NCS)2]. Inorg Chem 2002. [DOI: 10.1021/ic00129a015] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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127
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Alsters PL, Baesjou PJ, Janssen MD, Kooijman H, Sicherer-Roetman A, Spek AL, Van Koten G. Palladium and platinum diphenoxide and aryl phenoxide complexes with amine donors: effect of hydrogen bonding on structure and properties. Organometallics 2002. [DOI: 10.1021/om00060a032] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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128
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Rietveld MHP, Wehman-Ooyevaar ICM, Kapteijn GM, Grove DM, Smeets WJJ, Kooijman H, Spek AL, van Koten G. An Aryllithium Complex with Intramolecular Coordination of an o-Diamine Substituent. X-ray and Solution NMR Structures of Dimeric [Li{C6H4(CH2N(Me)CH2CH2NMe2)-2}]2. Organometallics 2002. [DOI: 10.1021/om00022a012] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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129
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Abbenhuis HCL, Feiken N, Grove DM, Jastrzebski JTBH, Kooijman H, Van der Sluis P, Smeets WJJ, Spek AL, Van Koten G. Use of an aryldiamine pincer ligand in the study of tantalum alkylidene-centered reactivity: tantalum-mediated alkene synthesis via reductive rearrangements and Wittig-type reactions. J Am Chem Soc 2002. [DOI: 10.1021/ja00051a008] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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130
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Wijsman GW, De Wolf WH, Bickelhaupt F, Kooijman H, Spek AL. Synthesis and x-ray crystal structure of 11-bromo-endo-9-chloro-7-ethoxybicyclo[5.3.1]undec-1(11)-ene. A stable highly strained anti-Bredt olefin. J Am Chem Soc 2002. [DOI: 10.1021/ja00049a063] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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131
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Beers OCP, Elsevier CJ, Kooijman H, Smeets WJJ, Spek AL. Reactions of monoazadienes with metal carbonyl complexes. 13a. Carbon-hydrogen bond-making and -breaking processes in heteronuclear monoazadienyl complexes: reactivity of HFeRu(CO)5{RC:C(H)C(H):NPr-iso} toward CO. Organometallics 2002. [DOI: 10.1021/om00032a047] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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132
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Tinga MAGM, Schat G, Akkerman OS, Bickelhaupt F, Horn E, Kooijman H, Smeets WJJ, Spek AL. Synthesis of cyclic bifunctional organomagnesium compounds. X-ray crystal structures of tetrameric organomagnesium clusters. J Am Chem Soc 2002. [DOI: 10.1021/ja00060a030] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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133
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van der Schaaf PA, Boersma J, Kooijman H, Spek AL, van Koten G. Thermally stable aryltungsten(VI) oxo and phenylimido complexes containing phenyl ligands with ortho-chelating tertiary amine substituents: molecular structures of W[(R)-C6H4CH(Me)NMe2-2]Cl3(:O) and W(C6H4CH2NMe2-2)Cl2(:NPh)(OCMe3). Organometallics 2002. [DOI: 10.1021/om00035a019] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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134
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Goede SJ, Van Schaik HP, Bickelhaupt F, Kooijman H, Spek AL. Synthesis and structure of phosphaalkenylmercury compounds. Organometallics 2002. [DOI: 10.1021/om00059a057] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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135
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Martens CF, Klein Gebbink RJM, Feiters MC, Kooijman H, Smeets WJJ, Spek AL, Nolte RJM. X-ray Structures of Mono- and Dinuclear Cu(II) Complexes of Novel Pyridine-Crown Ether Ligands. Inorg Chem 2002. [DOI: 10.1021/ic00102a031] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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136
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Buijink JKF, Teuben JH, Kooijman H, Spek AL. Synthesis, Molecular Structure, and Reactivity of a Half-Sandwich Vanadium(III) Imido Complex: The First Vanadium(V) Alkylidene. Organometallics 2002. [DOI: 10.1021/om00020a003] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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137
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Hogerheide MP, Wesseling M, Jastrzebski JTBH, Boersma J, Kooijman H, Spek AL, van Koten G. Versatility in Phenolate Bonding in Organoaluminum Complexes Containing Mono- and Bis-ortho-Chelating Phenolate Ligands. X-ray Structures of Al{OC6H2(CH2NMe2)2-2,6-Me-4}3, Al(Me)2{OC6H2(CH2NMe2)2-2,6-Me-4}.cntdot.N-AlMe3, and Al(Me)2{OC6H2(CH2NMe2)2-2,6-Me-4}.cntdot.N-AlMe3.cntdot.O-AlMe3. Organometallics 2002. [DOI: 10.1021/om00010a012] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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138
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Kapteijn GM, Dervisi A, Grove DM, Kooijman H, Lakin MT, Spek AL, van Koten G. Chemistry of Diamino-Ligated Methylpalladium(II) Alkoxide Complexes: Syntheses, x-ray Crystal Structures, and Hydrogen-Bond Formation. J Am Chem Soc 2002. [DOI: 10.1021/ja00149a017] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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139
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Aromí G, Gamez P, Roubeau O, Kooijman H, Spek AL, Driessen WL, Reedijk J. Ligand-Templated Four-Metal Chains Dimerize into a Unique [CuII8] Cluster. Angew Chem Int Ed Engl 2002. [DOI: 10.1002/1521-3757(20020402)114:7<1216::aid-ange1216>3.0.co;2-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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140
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Aromí G, Gamez P, Roubeau O, Kooijman H, Spek AL, Driessen WL, Reedijk J. Ligand-templated four-metal chains dimerize into a unique [Cu(II)(8)] cluster. Angew Chem Int Ed Engl 2002; 41:1168-70. [PMID: 12491248 DOI: 10.1002/1521-3773(20020402)41:7<1168::aid-anie1168>3.0.co;2-9] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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141
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Kooijman H, Spek AL, van Albada GA, Reedijk J. catena-Poly[[dicyanamido(5,5'-dimethyl-2,2'-bipyridine-kappa2N,N')copper(II)]-mu-dicyanamido-kappa2N1:N5]. Acta Crystallogr C 2002; 58:m124-6. [PMID: 11828101 DOI: 10.1107/s0108270101021515] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2001] [Accepted: 12/17/2001] [Indexed: 02/23/2023] Open
Abstract
In the crystal structure of the title compound, [Cu(C(2)N(3))(2)(C(12)H(12)N(2))](n), the Cu(II) atom adopts a distorted square-pyramidal geometry, the basal plane of which is formed by two N atoms of the bipyridine ligand, one N atom of a bidentate dicyanamide anion and one N atom of a monodentate dicyanamide anion [Cu-N = 1.9760(15)-2.0157(15)A]. The apical position is occupied by an N atom of a bidentate dicyanamide anion, located 2.2468(16)A from the Cu atom, thus forming a one-dimensional polymeric chain.
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142
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Sobolev A, Franssen MCR, Vigante B, Cekavicus B, Zhalubovskis R, Kooijman H, Spek AL, Duburs G, de Groot A. Effect of acyl chain length and branching on the enantioselectivity of Candida rugosa lipase in the kinetic resolution of 4-(2-difluoromethoxyphenyl)-substituted 1,4-dihydropyridine 3,5-diesters. J Org Chem 2002; 67:401-10. [PMID: 11798310 DOI: 10.1021/jo0104025] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Since 2,6-dimethyl-4-aryl-1,4-dihydropyridine 3,5-diesters themselves are not hydrolyzed by commercially available hydrolases, derivatives with spacers containing a hydrolyzable group were prepared. Seven acyloxymethyl esters of 5-methyl- and 5-(2-propoxyethyl) 4-[2-(difluoromethoxy)phenyl]-2,6-dimethyl-1,4-dihydro-3,5-pyridinedicarboxylate were synthesized and subjected to Candida rugosa lipase (CRL) catalyzed hydrolysis in wet diisopropyl ether. A methyl ester at the 5-position and a long or branched acyl chain at C3 gave the highest enantiomeric ratio (E values). The most stereoselective reaction (E = 21) was obtained with 3-[(isobutyryloxy)methyl] 5-methyl 4-(2-difluoromethoxyphenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate, and this compound was used to prepare both enantiomers of 3-methyl 5-(2-propoxyethyl) 4-[2-(difluoromethoxy)phenyl]-2,6-dimethyl-1,4-dihydro-3,5-pyridinedicarboxylate. The absolute configuration of the enzymatically produced carboxylic acid was established to be 4R by X-ray crystallographic analysis of its 1-(R)-phenylethyl amide.
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143
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Hotze ACG, Broekhuisen MET, Velders AH, Kooijman H, Spek AL, Haasnoot JG, Reedijk J. Crystallographic and NMR evidence of the unusual N6,N7-didentate chelation of 3-methyladenine coordinated to the cytotoxic α-dichlorobis(2-phenylazopyridine)ruthenium(ii) complex. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b204665m] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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144
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Söntjens SH, Meijer JT, Kooijman H, Spek AL, van Genderen MH, Sijbesma RP, Meijer EW. A multiple hydrogen-bond scaffold based on dipyrimidin-2-ylamine. Org Lett 2001; 3:3887-9. [PMID: 11720561 DOI: 10.1021/ol016750a] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A multiple hydrogen-bond array based on dipyrimidin-2-ylamine is presented, which is easily accessible. The influence of a preorganizing intramolecular hydrogen bond, tautomeric equilibria, and steric effects on the association behavior were investigated. X-ray diffraction shows that the molecules feature an ADA (acceptor-donor-acceptor) array of hydrogen-bonding sites in the solid state. The array persists in solution, and (1)H NMR titrations show that molecules with sterically nondemanding DAD arrays are selectively bound. [structure: see text]
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145
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Warzeska ST, Miccichè F, Mimmi MC, Bouwman E, Kooijman H, Spek AL, Reedijk J. Tuning the coordination mode in mononuclear manganese complexes by changing the steric bulk of the carboxylates. ACTA ACUST UNITED AC 2001. [DOI: 10.1039/b104975p] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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146
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Nijsen JF, van Steenbergen MJ, Kooijman H, Talsma H, Kroon-Batenburg LM, van De Weert M, van Rijk PP, De Witte A, Van Schip AD, Hennink WE. Characterization of poly(L-lactic acid) microspheres loaded with holmium acetylacetonate. Biomaterials 2001; 22:3073-81. [PMID: 11575483 DOI: 10.1016/s0142-9612(01)00055-2] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Holmium-loaded PLLA microspheres are useful systems in radioembolization therapy of liver metastases because of their low density, biodegradability and favourable radiation characteristics. Neutron activated Ho-loaded microspheres showed a surprisingly low release of the relatively small holmium complex. In this paper factors responsible for this behaviour are investigated, in particular by the use of differential scanning calorimetry, scanning electron microscopy, infrared spectroscopy and X-ray diffraction. The holmium complex is soluble in PLLA up to 8% in films and 17% in microspheres. Interactions between carbonyl groups of PLLA, and the Ho-ion in the HoAcAc complex, explain very satisfactorily the high stability of holmium-loaded microspheres.
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147
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Boer DR, Kooijman H, Groen M, van der Louw J, Kelder J, Kroon J. Conformational comparison of five follicular fluid meiosis-activating sterol-related active and inactive compounds. Acta Crystallogr C 2001; 57:1177-81. [PMID: 11600777 DOI: 10.1107/s0108270101010010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2001] [Accepted: 06/18/2001] [Indexed: 11/10/2022] Open
Abstract
The crystal structures of five follicular fluid meiosis-activating sterol-related Delta(8,14)-sterol compounds are presented. These are 4,4-dimethyl-23-phenyl-24-nor-5alpha-chola-8,14-dien-3beta-ol, C(31)H(44)O, 4,4-dimethyl-22-phenyl-23,24-dinor-5alpha-chola-8,14-dien-3beta-ol, C(30)H(42)O, (20R)-4,4-dimethyl-22-oxa-5alpha,20-cholesta-8,14,24-trien-3beta-ol, C(28)H(44)O(2), 4,4-dimethyl-23-phenyl-22-oxa-24-nor-5alpha-chola-8,14-dien-3beta-ol-water (4/1), 4C(30)H(42)O(2).H(2)O, and 4,4-dimethyl-5alpha-cholesta-8,14-dien-3-one, C(29)H(46)O. Two of the derivatives are inactive and three are active as agonists. Preliminary structure-activity relationship studies showed that the positions of the double bonds in the skeleton and the structures of the side chains are important determinants for activity. The conformations of the skeletons were compared with double-bond isomers retrieved from the Cambridge Structural Database [Allen & Kennard (1993). Chem. Des. Autom. News, 8, 1, 31-37]; no significant differences were found. Thus, conformational changes induced by the double bonds are not discriminative with respect to the activity of the compounds. Comparisons of the side-chain conformations of active and inactive structures revealed that the crystal structures were not conclusive as far as correlation of conformation and activity of the side chains were concerned.
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148
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Boer DR, Kooijman H, van der Louw J, Groen M, Kelder J, Kroon J. Relation between the molecular electrostatic potential and activity of some FF-MAS related sterol compounds. Bioorg Med Chem 2001; 9:2653-9. [PMID: 11557353 DOI: 10.1016/s0968-0896(01)00189-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Follicular Fluid-Meiosis Activating Sterol (FF-MAS) is a compound important for maturation of gametes in mammals. Therefore, it may serve as a lead compound for a novel method of contraception. We studied the Molecular Electrostatic Potential of a series of active and inactive analogues of FF-MAS. We find that double bond configurations required for activity result in a local negative electrostatic potential which is larger as well as more dense compared to those of inactive molecules. We therefore hypothesize that the interaction energy of the double bond system of the MAS compounds with its receptor substantially contributes to the overall interaction energy. This notion is supported by interaction studies of the electrostatic potential originating from the double bonds in crystal structures of cholesterol and four MAS-derived Delta(8,14) structures synthesized and crystallized by us. In addition, we were able to derive a pharmacophore model that relates the local average ESP and its distance to the 3beta-OH oxygen atom to the activity of the molecules.
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Aromí G, Carrero Berzal P, Gamez P, Roubeau O, Kooijman H, Spek AL, Driessen WL, Reedijk J. A Unique Asymmetric [Mn$\rm{^{II}_{3}}$] Triple-Stranded Helicate from a Symmetric Pentadentate Ligand Financial support by the European Union, under contract HPMF-CT-1999-00113 (Marie Curie Fellowship to G.A.), the WFMO (J.R.), and the CW-NOW (A.L.S.) is thankfully acknowledged. Angew Chem Int Ed Engl 2001; 40:3444-3446. [PMID: 11592165 DOI: 10.1002/1521-3773(20010917)40:18<3444::aid-anie3444>3.0.co;2-q] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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150
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Aromí G, Carrero Berzal P, Gamez P, Roubeau O, Kooijman H, Spek AL, Driessen WL, Reedijk J. A Unique Asymmetric [Mn] Triple-Stranded Helicate from a Symmetric Pentadentate Ligand. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3757(20010917)113:18<3552::aid-ange3552>3.0.co;2-q] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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