151
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Denissova I, Barriault L. Stereoselective formation of quaternary carbon centers and related functions. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.10.039] [Citation(s) in RCA: 460] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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152
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Satoh T, Kawashima T, Takahashi S, Sakai K. A new synthesis, including asymmetric synthesis, of spiro[4. n ]alkenones from three components: cyclic ketones, chloromethyl p -tolyl sulfoxide, and acetonitrile; and a formal total synthesis of racemic acorone. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.09.099] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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153
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Christoffers J, Schuster K. A novelL-neopentylglycine derivative as auxiliary for copper-catalyzed asymmetric Michael reactions. Chirality 2003; 15:777-82. [PMID: 14556214 DOI: 10.1002/chir.10293] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
L-Neopentylglycine diethylamide (4a). was prepared from the new unnatural amino acid L-neopentylglycine (1). The utilization of amide 4a as a chiral auxiliary in the copper(II)-catalyzed asymmetric Michael reaction was investigated in comparison with L-valine diethylamide (4b). Cyclic beta-oxocarboxylates 7 react with 4a and 4b to give the respective enaminoesters 8, which were converted with methyl vinyl ketone (9) in the presence of 10 mol% Cu(OAc)(2). H2O at room temperature in acetone to yield the optically active Michael addition products (R)-10a, b with high selectivity independent of the starting enamine. In the case of the seven-membered beta-oxocarboxylate 7c, however, the valine-derived enamine 8f led to higher enantioselectivity for product 10c. Despite the bulkiness of the neopentyl group, the isopropyl group with an alpha-branch has a better stereoinducing effect.
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Affiliation(s)
- Jens Christoffers
- Institut für Organische Chemie, Universität Stuttgart, Stuttgart, Germany.
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154
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Posner PG, Motherwell PW. Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)01130-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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155
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Tønder JE, Tanner D. Toward the enantioselective total synthesis of lyngbyatoxin A: on the stereocontrolled introduction of the quaternary stereogenic centre. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00822-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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156
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Satoh T, Sugiyama S, Kamide Y, Ota H. Conjugate addition of lithium ester enolates to 1-chlorovinyl p-tolyl sulfoxides: a novel synthesis of functionalized esters and lactones having a tertiary or a quaternary carbon at the β-position. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00636-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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157
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Posner PG, Motherwell PW. Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00841-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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158
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Yus M, Ramón DJ, Prieto O. Synthesis of new C2-symmetrical bis(hydroxycamphorsulfonamide) ligands and their application in the enantioselective addition of dialkylzinc reagents to aldehydes and ketones. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0957-4166(03)00045-4] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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159
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Highly enantioselective ene-type spiro-cyclization of allyl propargyl ethers catalyzed by cationic palladium(II) complexes with a new type of PN-ligand bearing achiral gem-dimethyl oxazoline. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1381-1169(02)00647-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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160
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Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00323-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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161
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Satoh T, Yoshida M, Takahashi Y, Ota H. A novel method for the asymmetric synthesis of 4,4-disubstituted 2-cyclopentenones from optically active 1-chlorovinyl p-tolyl sulfoxides and its application to the asymmetric total synthesis of (+)-α-cuparenone. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0957-4166(02)00797-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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162
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Posner G, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)01503-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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163
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164
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Konopelski JP, Lin J, Wenzel PJ, Deng H, Elliott GI, Gerstenberger BS. Carbanion stabilization by distal silyloxy groups. Origin of the high diastereoselectivity in the formation of quaternary centers with aryllead(IV) triacetate reagents. Org Lett 2002; 4:4121-4. [PMID: 12423101 DOI: 10.1021/ol026863+] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Derivatives of methyl 5-hydroxy-2-oxo-1-cyclohexanecarboxylate react with aryllead(IV) reagents in high yield and with wide variation in diastereoselectivity. Ab initio calculations are consistent with a heretofore unrecognized attraction between the carbanionic center of the beta-ketoester intermediate and the distal OSiR(3) group. This attractive interaction stabilizes the silyl group in the axial conformation and leads to the excellent trans diastereoselection in the formation of quaternary centers. [reaction: see text]
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Affiliation(s)
- Joseph P Konopelski
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA.
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165
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Pearson AJ, Wang X. Intramolecular coupling between cyclohexadiene–Fe(CO)3 complexes and pendant alkenes: formation of azaspiro[5,5]undecane derivatives. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01827-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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166
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Highly enantioselective addition of dialkylzinc reagents to ketones promoted by titanium tetraisopropoxide. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0957-4166(02)00572-4] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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167
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Construction of functionalised medium rings by stereospecific expansions of 2,3-epoxy alcohols under mild conditions. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01450-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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168
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Yoshida M, Sugimoto K, Ihara M. Stereoselective synthesis of α-disubstituted cyclopentanones by palladium-catalyzed rearrangement of allenylcyclobutanols with aryl halides. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00910-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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169
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Diedrichs N, Krelaus R, Gedrath I, Westermann B. Kinetic resolution of oxime esters with lipases synthesis of enantiomerically enriched building blocks with quaternary carbon centers and formal total synthesis of perhydro histrionicotoxin. CAN J CHEM 2002. [DOI: 10.1139/v02-097] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Enantiomerically enriched oximes bearing stereogenic quaternary carbon centers can be obtained by lipase-catalyzed kinetic resolution of oxime esters. Substrate specificity, solvent effects, and the use of different lipases are discussed. Kinetic resolution of butyrylated oximes by lipase PS in the presence of n-butanol gave the best ee-values of both the saponified oxime and the residual oxime ester. Subsequent stereospecific Beckmann rearrangement of an enantiomerically enriched oxime provided lactams, which could be employed for the synthesis of optically active perhydro histrionicotoxin.Key words: oxime, lipase, kinetic resolution, Beckmann rearrangement, perhydro histrionicotoxin.
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170
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Christoffers J, Scharl H. Copper-Catalyzed Asymmetric Michael Reactions with α-Amino Acid Amides: Synthesis of an Optically Active Piperidine Derivative. European J Org Chem 2002. [DOI: 10.1002/1099-0690(200205)2002:9<1505::aid-ejoc1505>3.0.co;2-k] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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171
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Satoh T, Sugiyama S, Ota H. A novel synthesis of carboxylic acid derivatives having a quaternary carbon at 3-position and functional groups at 4-position from 1-chlorovinyl p-tolyl sulfoxides and acetic acid esters. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00414-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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172
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Kulkarni MG, Rasne RM, Davawala SI, Doke AK. Allyl vinyl ethers via Wittig olefination: a short and efficient synthesis of (±)-mesembrine. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00227-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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173
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Wang F, Tu YQ, Fan CA, Wang SH, Zhang FM. Kinetic resolution via semipinacol rearrangement of α-hydroxy epoxides: a new method for asymmetric synthesis of α-hydroxy epoxides and β-hydroxy ketones containing an α-quaternary carbon. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0957-4166(02)00108-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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174
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175
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Abstract
The stereoselective formation of C-C bonds is of great importance for the synthesis of enantiomerically pure natural products and pharmaceuticals. A broad repertoire of chiral auxiliaries, reagents, and catalysts can be utilized for the reliable generation of tertiary stereocenters. In contrast, the synthesis of organic compounds with quaternary stereocenters is a much more demanding and challenging task. Every enantioselective synthetic method can demonstrate its value through the generation of a fully substituted carbon center. In this Minireview examples of newer stoichiometric and catalytic methods are summarized which have proved their suitability for the enantioselective construction of quaternary stereocenters.
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Affiliation(s)
- Jens Christoffers
- Institut für Organische Chemie der Universität Stuttgart Pfaffenwaldring 55, 70569 Stuttgart (Germany)
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176
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Trost BM, Lee C. gem-Diacetates as carbonyl surrogates for asymmetric synthesis. Total syntheses of sphingofungins E and F. J Am Chem Soc 2001; 123:12191-201. [PMID: 11734018 DOI: 10.1021/ja0118338] [Citation(s) in RCA: 131] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The equivalent of an asymmetric addition to a carbonyl group with a stabilized anion is accomplished by discriminating between the enantiotopic C-O single bonds of a gem-diacetate. In this way, enantioselective total syntheses of two antifugal agents, sphingofungins E and F, have been accomplished. The synthetic strategy is based on a series of catalytic processes whereby all of the chiral centers are created with high stereoselectivities. The first two stereocenters are introduced by an asymmetric allylic alkylation reaction of gem-diacetate 9 with azlactone 10. The complex of Pd(0) and ligand 14 efficiently catalyzes this key reaction, which differentiates both the enantiotopic leaving groups of a gem-diacetate and enantiotopic faces of the enolate of an azlactone in high enantiomeric excess and diastereomeric excess. From these two stereocenters, the configurations of the remaining two centers are set by a diastereoselective Os(VIII)-catalyzed dihydroxylation reaction with excellent stereocontrol. The trans-alkene is established by Cr(II)-mediated olefination, and a subsequent B-alkyl Suzuki coupling reaction conjoins the polar head unit and the nonpolar, 13-carbon lipid tail. The efficiency of our strategy is illustrated by the completion of syntheses of sphingofungins F and E in 15 and 17 steps, and in 17% and 5% overall yields, respectively.
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Affiliation(s)
- B M Trost
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
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177
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Satoh T, Yoshida M, Ota H. Asymmetric synthesis of 4,4-disubstituted 2-cyclopentenones from optically active 1-chlorovinyl p-tolyl sulfoxides and cyanomethyllithium with formation of a quaternary chiral center. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)02034-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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178
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Bois-Choussy M, Cadet S, De Paolis M, Zhu J. Diethyl oxomalonate as a three carbon synthon for synthesis of functionalized 1,1′-disubstituted tetrahydroisoquinoline. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00776-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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179
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180
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181
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Investigation of the synthesis of angular tricyclic compounds by intramolecular Pauson–Khand reaction of exo- and endo-cyclic enynes. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00151-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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182
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Cross-coupling of nonstabilized aziridinylmagnesiums with alkylhalides catalyzed by Cu(I) iodide: a new synthesis of amines bearing a quaternary chiral center and an asymmetric synthesis of both enantiomers of the amines from one chiral starting material. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00278-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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183
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Clive DL, Huang X. Stereocontrolled formation of spiro enones by radical cyclization of bromo acetals. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00226-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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184
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You SL, Hou XL, Dai LX, Zhu XZ. Highly efficient ligands for palladium-catalyzed asymmetric alkylation of ketone enolates. Org Lett 2001; 3:149-51. [PMID: 11430021 DOI: 10.1021/ol0067033] [Citation(s) in RCA: 143] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[figure: see text] Ferrocene-modified chiral pocket ligands have been studied in the palladium-catalyzed asymmetric alkylation of simple ketone enolates, in which (R,R,Sp,Sp)-1 containing two pairs of matched chiralities, central chirality and planar chirality, behaved very efficiently in this reaction and up to 95% ee value was achieved.
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Affiliation(s)
- S L You
- Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
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185
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Brunel JM, Tenaglia A, Buono* G. Enantioselective formation of quaternary centers on β-ketoesters with chiral palladium QUIPHOS catalyst. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0957-4166(00)00337-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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186
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Hong JH, Gao MY, Choi Y, Cheng YC, Schinazi RF, Chu CK. Synthesis of novel 3'-C-methyl-apionucleosides: an asymmetric construction of a quaternary carbon by Claisen rearrangement. Carbohydr Res 2000; 328:37-48. [PMID: 11005574 DOI: 10.1016/s0008-6215(00)00005-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of 2,3-dideoxy-3-C-(hydroxymethyl)-3-C-methyl-D-glycero-tetrofuranosyl++ + nucleosides was accomplished in high enatiomeric purity (98.5% ee) via [3,3]-sigmatropic Claisen rearrangement of (E)(S)-5-benzyloxy-1-tert-butyldimethylsilanyloxy-4-methyl-pent-3- en-2-ol prepared from 2,3-O-isopropylidene-D-glyceraldehyde. The synthesized nucleosides were assayed against human immunodeficiency virus (HIV) and hepatitis B virus in human peripheral blood mononuclear (PBM) and 2.2.15 cells, respectively. 6-Amino-9-[2,3-dideoxy-3-C-(hydroxymethyl)-3-C-methyl-beta-D-glycero- tetrofuranosyl]-2-fluoropurine shows moderate antiviral activity (EC50 = 2.55 microM) against HIV-1 strains and 6-amino-9-[3-deoxy-3-C-(hydroxymethyl)-3-methyl-alpha-D-glycero-tetro furanosyl]-2-fluoropurine exhibits potent anti-HIV activity (EC50 = 0.073 microM) with significant cytotoxicity (IC50 = 1.0 microM).
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Affiliation(s)
- J H Hong
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, The University of Georgia, Athens 30602, USA
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187
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Satoh T, Matsue R, Fujii T, Morikawa S. Alkylation of nonstabilized aziridinylmagnesiums catalyzed by Cu(I) iodide: a new synthesis of amines, including optically active form, bearing a quaternary chiral center. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01085-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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188
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189
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Satoh T, Ota H. Reaction of 1-Chlorovinyl p-Tolyl Sulfoxides with Carbanion of Acetonitrile: A Novel Synthesis of Cyclopentanone Derivatives with Three Consecutive Carbon–Carbon Bond-Formations via the Enaminonitriles. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00187-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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190
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191
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Wee AG, Yu Q. Total synthesis of (−)-eburnamonine and (+)-epi-eburnamonine from a chiral non-racemic 4,4-disubstituted γ-lactone. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(99)02131-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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192
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Abele S, Seebach D. Preparation of Achiral and of Enantiopure Geminally Disubstituted β-Amino Acids for β-Peptide Synthesis. European J Org Chem 2000. [DOI: 10.1002/(sici)1099-0690(200001)2000:1<1::aid-ejoc1>3.0.co;2-6] [Citation(s) in RCA: 241] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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193
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Grossman RB, Skaggs AJ, Kray AE, Patrick BO. Double Annulation Route to Fused Bicyclic Compounds with Three Contiguous Quaternary Centers. Org Lett 1999. [DOI: 10.1021/ol990935o] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robert B. Grossman
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055
| | - Aaron J. Skaggs
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055
| | - Arlene E. Kray
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055
| | - Brian O. Patrick
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055
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194
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195
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An asymmetric oxazoline ketenimine rearrangement. Construction of chiral α-quaternary carbon ketones. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00729-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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196
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Kato J, Seo A, Kiso K, Kudo K, Shiraishi S. Synthesis of 2,8-Dioxaspiro[4.5]decane-1,3,7,9-tetrone and the Reactions with Amines. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1999. [DOI: 10.1246/bcsj.72.1075] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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197
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Regio- and stereoselective rearrangement reactions of various α,β-epoxy acylates: Suitable combination of acyl groups and Lewis acids. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00183-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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198
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Yamashita Y, Odashima K, Koga K. Construction of chiral quaternary carbon centers by asymmetric alkylation of achiral lithium enolates mediated by chiral tetradentate ligands: Stoichiometric and catalytic approaches. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00299-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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199
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Total synthesis of the coccinellid alkaloid (−)-adalinine and the assignment of its absolute configuration. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(98)02444-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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200
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Grossman RB, Varner MA, Skaggs AJ. Double Annulation Route to Highly Substituted and Functionalized Trans-Fused Bicyclic Compounds. J Org Chem 1998. [DOI: 10.1021/jo9822737] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Robert B. Grossman
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055
| | - Melissa A. Varner
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055
| | - Aaron J. Skaggs
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055
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