151
|
McNulty J, Millar MJ, Bernardinelli G, Jefford CW. Stereoselective Oxidative Dimerization of (1R)-Camphor. A Short Synthesis of exo,exo‘-3,3‘-Biisoborneol. J Org Chem 1999; 64:5312-5314. [DOI: 10.1021/jo990394g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
152
|
Hanessian S, Ma J, Wang W. Stereocontrolled solution and solid phase enolate alkylations and hydroxylations — generation of three and four contiguous stereogenic carbon atoms in acyclic systems. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00782-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
153
|
Chiral (E,E)-1,4-dialkoxy-1,3-butadienes. 2. Conformational studies and Diels-Alder reactions with symmetric dienophiles. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00086-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
154
|
García Martínez A, Teso Vilar E, García Fraile A, de la Moya Cerero S, Martínez Ruiz P. Electron impact fragmentation patterns of 3,3-dimethyl-1, 2-norbornane derivatives. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 1999; 13:1472-1476. [PMID: 10407341 DOI: 10.1002/(sici)1097-0231(19990730)13:14<1472::aid-rcm669>3.0.co;2-v] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The electron impact mass spectra of several 3,3-dimethyl-1, 2-norbornanediols, diamines, amino alcohols and related derivatives have been studied and their fragmentation pathways discussed. Different fragmentation patterns were observed, depending not only on the nature of the substituents, but also on their relative positions on the norbornane framework. In general, the dominant peaks in the spectra of these compounds originate from initial C1-C2 bond cleavage (alpha-cleavage) with charge retention on the heteroatom (oxygen or nitrogen) attached at the bridgehead position, followed by hydride shift and loss of the C2-C3 fragment by homolytic cleavage of the C3-C4 bond. This fragmentation pathway leads to a highly stabilized cyclopentenylimmonium or cyclopentenyloxonium ion, which constitutes the base peak in the spectra in most of the studied compounds. Copyright 1999 John Wiley & Sons, Ltd.
Collapse
|
155
|
Asymmetric synthesis of β-amino acids and β-lactam derivatives via conjugate addition of metal amides. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s1874-5148(98)80003-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
|
156
|
Knollmüller M, Gärtner P, Ferencic M, Noe CR, Mereiter K. An Improved Method for theendo-Fusion of Five-Membered Ring Lactones to the Bornane Ring System. European J Org Chem 1998. [DOI: 10.1002/(sici)1099-0690(199811)1998:11<2507::aid-ejoc2507>3.0.co;2-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
157
|
Knollmüller M, Ferencic M, Gärtner P, Mereiter K, Noe CR. New camphor derived chiral ligands for asymmetric synthesis. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0957-4166(98)00410-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
158
|
Vasconcellos ML, Mellão ML, Barreiros UG, Branco MC, T.P.Gambardella M, Ramos OF, Ribeiro M. Synthesis and Structural Determination of New Potential Chiral Tridentate Ligands Derivated from 1-(R)-(+)-Camphor. SYNTHETIC COMMUN 1998. [DOI: 10.1080/00397919808004968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
159
|
Tomooka K, Nagasawa A, Nakai T. Double Stereocontrol in α-Alkylation of Chiral Lithium Dienolates Generated from (E)-α,β-Olefinic Amides and Esters. CHEM LETT 1998. [DOI: 10.1246/cl.1998.1049] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
160
|
|
161
|
Jankowski P, Marczak S, Wicha J. Methods for the construction of trans-hydrindane rings and their origins in steroid chemistry. Vitamin D total synthesis. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)00570-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
162
|
Barrett AGM, Braddock DC, Christian PWN, Pilipauskas D, White AJP, Williams DJ. Diastereoselective Conjugate Addition to (+)-Camphorsulfonic Acid Derived Nitroalkenes: Synthesis of alpha-Hydroxy and alpha-Amino Acids. J Org Chem 1998; 63:5818-5823. [PMID: 11672182 DOI: 10.1021/jo980582r] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diastereoselective tandem conjugate addition of both oxygen- and nitrogen-centered nucleophiles to the novel (1S)-10-camphorsulfonic acid derived nitroalkenes 9, 10, and 11 and ozonolysis gave the alpha-hydroxy and alpha-amino thiol acid derivatives 12, 13, and 14. In all cases, the (R)-diastereomer was formed as the major component albeit with only modest levels of selectivity (33-71% de). The structures of the products and the stereochemistry of the Michael addition step were unequivocally established by X-ray crystallographic studies of nitroalkenes 9 and 10 and (2S)-12c and (2R)-13a and by alternative syntheses from (S)-alanine, (S)-valine, and ethyl (S)-lactate.
Collapse
Affiliation(s)
- Anthony G. M. Barrett
- Department of Chemistry, Imperial College, South Kensington, London, SW7 2AY, UK and Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208
| | | | | | | | | | | |
Collapse
|
163
|
Highly enantioselective synthesis of syn- and anti-propionate aldols without diastereoselection in the chiral oxazaborolidinone-promoted aldol reaction with a silyl ketene acetal derived from ethyl 2-(methylthio)propionate. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0957-4166(98)00159-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
164
|
Garcı́a Martı́nez A, Teso Vilar E, Garcı́a Fraile A, de la Moya Cerero S, Martı́nez Ruiz P. Synthesis of enantiopure norbornane derivatives. Effect of bridgehead substituent on the π-facial selectivity of the reduction of 2-norbornanones and their oximes. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0957-4166(98)00132-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
165
|
Affiliation(s)
- Kurt V. Gothelf
- Center for Metal Catalyzed Reactions, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | | |
Collapse
|
166
|
|
167
|
Affiliation(s)
- Mauro Panunzio
- Dipartimento di Chimica “G. Ciamician”, CSFM-CNR, Via Selmi, 2, 40126 Bologna, Italy, and GlaxoWellcome: Lead Discovery Laboratory, Via Fleming, 4, 37100 Verona, Italy
| | - Paola Zarantonello
- Dipartimento di Chimica “G. Ciamician”, CSFM-CNR, Via Selmi, 2, 40126 Bologna, Italy, and GlaxoWellcome: Lead Discovery Laboratory, Via Fleming, 4, 37100 Verona, Italy
| |
Collapse
|
168
|
Enders D, Thomas CR, Raabe G, Runsink J. Enantioselektive Synthese von ?-substituiertenN-Methyl-sulfonamiden. Vorl�ufige Mitteilung. Helv Chim Acta 1998. [DOI: 10.1002/hlca.19980810543] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
169
|
Brzezinski LJ, Rafel S, Leahy JW. The asymmetric Baylis-Hillman reaction as a template in organic synthesis. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)01025-9] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
170
|
Asano Y, Iida A, Tomioka K. Enantioselective conjugate additions of organolithiums to BHA enoates mediated by A chiral ligand. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)10366-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
171
|
Ahn KH, Ham C, Kim SK, Cho CW. Practical Synthesis of Chiral Sultam Auxiliaries: 3-Substituted- 1,2-benzisothiazoline 1,1-Dioxides. J Org Chem 1997. [DOI: 10.1021/jo970917p] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kyo Han Ahn
- Department of Chemistry and Center for Biofunctional Molecules, Pohang University of Science & Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784, Republic of Korea
| | - Cheol Ham
- Department of Chemistry and Center for Biofunctional Molecules, Pohang University of Science & Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784, Republic of Korea
| | - Seung-Kee Kim
- Department of Chemistry and Center for Biofunctional Molecules, Pohang University of Science & Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784, Republic of Korea
| | - Chang-Woo Cho
- Department of Chemistry and Center for Biofunctional Molecules, Pohang University of Science & Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784, Republic of Korea
| |
Collapse
|
172
|
Padwa A, Prein M. π-Facial Diastereoselection in [3 + 2]-Cycloadditions of Isomünchnone Dipoles. J Org Chem 1997. [DOI: 10.1021/jo970625o] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | - Michael Prein
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| |
Collapse
|
173
|
Mish MR, Guerra FM, Carreira EM. Asymmetric Dipolar Cycloadditions of Me3SiCHN2. Synthesis of a Novel Class of Amino Acids: Azaprolines. J Am Chem Soc 1997. [DOI: 10.1021/ja971708p] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael R. Mish
- Arnold and Mabel Beckman Laboratory for Chemical Synthesis, California Institute of Technology Pasadena, California 91125
| | - Francisco M. Guerra
- Arnold and Mabel Beckman Laboratory for Chemical Synthesis, California Institute of Technology Pasadena, California 91125
| | - Erick M. Carreira
- Arnold and Mabel Beckman Laboratory for Chemical Synthesis, California Institute of Technology Pasadena, California 91125
| |
Collapse
|
174
|
Boyd VA, Perales JB, Negrete GR. Design and Implementation of New Auxiliaries for Asymmetric Enolate Alkylations. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01576-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
175
|
Echarri, M R, Matheu I, Claver C, Castillión S, Alvarez-Larena A, Piniella JF. A New Reaction of Tetrabutylammonium Camphorsulfonate with P4S10. Synthesis and Crystal Structure of the First Chiral Tetrathiophosphate Derivative. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01476-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
176
|
Fonquerna S, Moyano A, Pericàs MA, Riera A. A convenient preparation of N-(2-alkynoyl) derivatives of chiral oxazolidin-2-ones and bornane-10,2-sultam. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0957-4166(97)00167-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
177
|
Asymmetric construction of two contiguous stereocenters by diastereoface differentiating addition reaction of thiols to chiral imides: Formal synthesis of (+)-diltiazem. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(96)01191-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
178
|
Nakamura T, Hashimoto N, Ishizuka T, Kunieda T. Sterically constrained tricyclic 2-oxazolidinone as excellent chiral auxiliary. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(96)02402-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
179
|
Fraile JM, García JI, Gracia D, Mayoral JA, Pires E. First Asymmetric Diels−Alder Reactions of Furan and Chiral Acrylates. Usefulness of Acid Heterogeneous Catalysts. J Org Chem 1996. [DOI: 10.1021/jo961513k] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- José M. Fraile
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, C.S.I.C.-Universidad de Zaragoza, Facultad de Ciencias, E-50009 Zaragoza, Spain
| | - José I. García
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, C.S.I.C.-Universidad de Zaragoza, Facultad de Ciencias, E-50009 Zaragoza, Spain
| | - David Gracia
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, C.S.I.C.-Universidad de Zaragoza, Facultad de Ciencias, E-50009 Zaragoza, Spain
| | - José A. Mayoral
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, C.S.I.C.-Universidad de Zaragoza, Facultad de Ciencias, E-50009 Zaragoza, Spain
| | - Elisabet Pires
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, C.S.I.C.-Universidad de Zaragoza, Facultad de Ciencias, E-50009 Zaragoza, Spain
| |
Collapse
|
180
|
Tomooka K, Nagasawa A, Wei SY, Nakai T. Chiral dienolate chemistry in remote asymmetric induction: the allylation / cope rearrangement sequence leading to γ-chiral α, β-unsaturated acid derivatives. Tetrahedron Lett 1996. [DOI: 10.1016/s0040-4039(96)02077-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
181
|
Tomooka K, Nagasawa A, Wei SY, Nakai T. Chiral dienolate chemistry in remote asymmetric induction: The asymmetric aldol / oxycope strategy for asymmetric synthesis of γ,δ-dichiral α, β-unsaturated acid derivatives. Tetrahedron Lett 1996. [DOI: 10.1016/s0040-4039(96)02078-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
182
|
Cabral LM, Costa PRR, Vasconcellos MLAA, Barreiro EJ, Castr RN. Asymmetric Friedel - Crafts Reaction: An Application to the Synthesis of an Etodolac Analogue. SYNTHETIC COMMUN 1996. [DOI: 10.1080/00397919608003781] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
183
|
Moloney MG, Paul DR, Thompson RM, Wright E. Chiral carboxylic acid ligands derived from camphoric acid. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0957-4166(96)00328-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
184
|
|
185
|
Yechezkel T, Ghera E, Ramesh NG, Hassner A. Asymmetric synthesis of substituted cyclopentanes via Michael initiated ring closure reactions. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0957-4166(96)00301-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
186
|
Hanessian S, Yang RY. The asymmetric synthesis of allylglycine and other unnatural α-amino acids via zinc-mediated allylation of oximes in aqueous media. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(96)01118-5] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
187
|
Tanaka K, Ahn M, Watanabe Y, Fuji K. Asymmetric synthesis of uncommon α-amino acids by diastereoselective alkylations of a chiral glycine equivalent. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0957-4166(96)00212-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
188
|
|
189
|
|
190
|
Palomo C, Oiarbide M, Gonaz'alez A, García JM, Berrée F. Exo,exo-2,3-Diaminoborneol-derived imidazolidinone as chiral auxiliary for asymmetric alkylations. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(96)00847-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
191
|
|
192
|
|
193
|
Assfeld X, García J, García JI, Mayoral JA, Proietti MG, Ruiz-López MF, Sánchez MC. Investigation of Dienophile-TiCl(4) Complexation by Means of X-ray Absorption and (13)C-NMR Spectroscopies. J Org Chem 1996; 61:1636-1642. [PMID: 11667029 DOI: 10.1021/jo950945c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) techniques, in combination with (13)C-NMR spectroscopy, have been used to study the complexation of methyl acrylate (1), N-acryloylbenzylamine (2), O-acryloyl-(R)-pantolactone (3), methyl N-acryloyl-(S)-prolinate (4), and methyl N-acryloyl-(S)-phenylalaninate (5) with excess TiCl(4) in solution. The results obtained show that TiCl(4) has a great tendency to coordinate with two ester ligands, but this tendency is not so marked with amides, which is related to the greater basicity of the latter. Complexation increases the Ti-Cl bond distance, in comparison with TiCl(4), which is clearly shown by the EXAFS spectra. Chelate complexes are formed with bidentate ligands, but comparison between the EXAFS spectra, obtained with different TiCl(4)/dienophile ratios, shows that chelation is more difficult with methyl N-acryloyl-(S)-phenylalaninate (5).
Collapse
Affiliation(s)
- Xavier Assfeld
- Laboratoire de Chimie Théorique, URA-C.N.R.S. 510, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandoeuvre-lès-Nancy Cedex, France, and Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain
| | | | | | | | | | | | | |
Collapse
|
194
|
Chung YJ, Ryu EJ, Keum G, Kim BH. Synthesis of 2-isoxazoline and alpha-hydroxy ketomethylene dipeptide isosteres. Bioorg Med Chem 1996; 4:209-25. [PMID: 8814879 DOI: 10.1016/0968-0896(95)00174-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We have developed a simple and stereoselective method for synthesizing novel dipeptide isosteres using nitrile oxide cycloaddition as a key reaction. Employing this method, we have prepared efficiently various peptidomimetics containing 2-isoxazolines and alpha-hydroxy ketomethylene dipeptide isosteres.
Collapse
Affiliation(s)
- Y J Chung
- Department of Chemistry, Pohang University of Science and Technology, Korea
| | | | | | | |
Collapse
|
195
|
Ghosh AK, Mathivanan P. ASYMMETRIC DIELS-ALDER REACTION : CIS-1-ARYLSULFONAMIDO-2-INDANOLS AS HIGHLY EFFECTIVE CHIRAL AUXILIARIES. TETRAHEDRON, ASYMMETRY 1996; 7:375-378. [PMID: 30382247 PMCID: PMC6205156 DOI: 10.1016/0957-4166(96)00010-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Lewis acid promoted Diels-Alder reaction of acrylate esters of cis-1-arylsulfonamido-2-indanols and cyclopentadiene provided exclusively endo-adducts with high endo-diastereoselectivities.
Collapse
Affiliation(s)
- Arun K Ghosh
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607
| | - Packiarajan Mathivanan
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607
| |
Collapse
|
196
|
Fevig JM, Abelman MM, Brittelli DR, Kettner CA, Knabb RM, Weber PC. Design and synthesis of ring-constrained boropeptide thrombin inhibitors. Bioorg Med Chem Lett 1996. [DOI: 10.1016/0960-894x(96)00015-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
197
|
Affiliation(s)
- Scott E. Denmark
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801
| | | |
Collapse
|
198
|
Braslau R, Naik N, Olmstead MM. Unexpected Rearrangement of a Borneol-Derived O-Benzylated Hydroxamic Acid: Facile Synthesis of an Optically Active Multidentate Ligand. J Org Chem 1996. [DOI: 10.1021/jo951154d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rebecca Braslau
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064
| | - Neeta Naik
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064
| | | |
Collapse
|
199
|
Chung SK, Kang DH. Asymmetric synthesis of α-aminophosphonates via diastereoselective addition of phosphite to chiral imine derivatives. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0957-4166(95)00411-4] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
200
|
Addition of organocopper reagents to allylic acrylates — the preparation of γ, δ-unsaturated acids and subsequent functionalization to γ-lactones. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)00804-h] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|