701
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Franzén J, Bäckvall JE. Carbon-carbon bond formation in palladium(II)-catalyzed allylic oxidation: a novel oxidative carbocyclization of allene-substituted olefins. J Am Chem Soc 2003; 125:6056-7. [PMID: 12785826 DOI: 10.1021/ja029505a] [Citation(s) in RCA: 115] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new efficient palladium(II)-catalyzed oxidative carbocyclization has been developed. It was found that allene-substituted olefins 1 cyclized in the presence of 1 mol % Pd(O2CCF3)2 and p-benzoquinone (2 equiv) to give bicyclic ring systems 2 in good to excellent yields. The cyclization constitutes a new type of carbon-carbon bond forming reaction between an allene and an olefin under oxidative conditions.
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Affiliation(s)
- Johan Franzén
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, Sweden
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702
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Huang CW, Shanmugasundaram M, Chang HM, Cheng CH. Highly chemoselective coupling of allenylstannanes with organic iodides promoted by Pd(PPh3)4/LiCl: an efficient method for the synthesis of substituted allenes. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00516-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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703
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Ma S, Hao X, Huang X. Reversed stereoselectivity in iodohydroxylation of allenyl sulfides. An efficient synthesis of (Z)-3-organosulfur-2-iodo-2-propenols. Org Lett 2003; 5:1217-9. [PMID: 12688723 DOI: 10.1021/ol034109y] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] It is observed that the iodohydroxylation of 1,2-allenyl sulfides with I(2) and water in aqueous acetone showed Z-selectivity, which is opposite to that of the iodohydroxylation of 1,2-allenyl sulfoxides.
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Affiliation(s)
- Shengming Ma
- Department of Chemistry, Zhejiang University, Hangzhou 310027, P R China.
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704
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Sydnes LK. Allenes from cyclopropanes and their use in organic synthesis-recent developments. Chem Rev 2003; 103:1133-50. [PMID: 12683779 DOI: 10.1021/cr010025w] [Citation(s) in RCA: 340] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Leiv K Sydnes
- Department of Chemistry, University of Bergen, Allégt. 41, NO-5007 Bergen, Norway.
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705
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Aurrecoechea JM, Pérez E. Palladium-catalyzed cyclization/allylation of in situ-generated α-hydroxy-[3]-cumulene samarium alkoxides: synthesis of allylated furans. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)00636-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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706
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Canovese L, Chessa G, Santo C, Visentin F, Uguagliati P. Insertion of 1,1-Me2propadiene across the Pd–C bond of pyridyl–thioether methyl complexes. A mechanistic study. Inorganica Chim Acta 2003. [DOI: 10.1016/s0020-1693(02)01432-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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707
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Grigg R, Hodgson A, Morris J, Sridharan V. Sequential Pd/Ru-catalysed allenylation/olefin metathesis/1,3-dipolar cycloaddition route to novel heterocycles. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(02)02736-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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708
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Liu G, Lu X. Palladium(II)-catalyzed coupling of allenoic acids and α,β-unsaturated carbonyl compounds through tandem intramolecular oxypalladation and conjugate addition reactions. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(02)02507-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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709
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Huang X, Xiong ZC. A novel one-pot three-component tandem Michael/aldol/Horner–Wadsworth–Emmons (HWE) reaction of lithium alkylselenolates with 1-alkynylphosphine oxides and aldehydes: facile synthesis of selenium-substituted allenes. Chem Commun (Camb) 2003. [DOI: 10.1039/b304527g] [Citation(s) in RCA: 11] [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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710
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Ma S, Jiao N. Pd0-Catalyzed Three-Component Tandem Double-Addition-Cyclization Reaction: Stereoselective Synthesis ofcis-Pyrrolidine Derivatives. Angew Chem Int Ed Engl 2002. [DOI: 10.1002/ange.200290032] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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711
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Ma S, Jiao N. Pd0-catalyzed three-component tandem double-addition-cyclization reaction: stereoselective synthesis of cis-pyrrolidine derivatives. Angew Chem Int Ed Engl 2002; 41:4737-40. [PMID: 12481343 DOI: 10.1002/anie.200290033] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shengming Ma
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, P.R. China.
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712
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Oh CH, Rhim CY, Song CH, Ryu JH. Palladium-catalyzed Arylative Cyclizations of Allenylmalonates with Aryl Halides. CHEM LETT 2002. [DOI: 10.1246/cl.2002.1140] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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713
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Palladium catalysed queuing processes. Part 4: Termolecular cyclisation–anion capture cascades employing allene as a relay switch and secondary amines as nucleophiles. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00763-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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714
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Franzén J, Löfstedt J, Dorange I, Bäckvall JE. Allenes as carbon nucleophiles in palladium-catalyzed reactions: observation of anti attack of allenes on (pi-allyl)palladium complexes. J Am Chem Soc 2002; 124:11246-7. [PMID: 12236720 DOI: 10.1021/ja026150m] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the palladium-catalyzed cyclization of allenic allylic esters using Pd(dba)2 as catalyst, it was shown that the allene acts as a carbon nucleophile. Intermediates were isolated and stereochemical studies established that the double bond of the allene has attacked the (pi-allyl)palladium intermediate on the face opposite to that of palladium.
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Affiliation(s)
- Johan Franzén
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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715
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Zhang W, Haight AR, Hsu MC. Palladium-catalyzed coupling of alkynes with alcohols and carboxylic acids. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01436-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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716
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Ma S, Gao W. Efficient synthesis of 4-(2'-alkenyl)-2,5-dihydrofurans and 5,6-dihydro-2H-pyrans via the Pd-catalyzed cyclizative coupling reaction of 2,3- or 3,4-allenols with allylic halides. J Org Chem 2002; 67:6104-12. [PMID: 12182649 DOI: 10.1021/jo0163997] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In the absence of a base, palladium(II) catalysts, such as PdCl(2), PdCl(2)(CH(3)CN)(2), Pd(OAc)(2), and [(pi-C(3)H(5))PdCl](2), can catalyze the cyclizative coupling reaction of 2,3- or 3,4-allenols with allylic halides in DMA at room temperature to provide 2,5-dihydrofurans and 5,6-dihydro-2H-pyrans, respectively, in moderate to good yields. Under similar reaction conditions, nonsubstituted 2,3-allenol 1s affords bimolecular cyclizative coupling product 5s as the major product. The scope of the reaction and its mechanism have been studied briefly. On the basis of the experimental results, the transformation was believed to proceed via a divalent palladium-catalyzed pathway.
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Affiliation(s)
- Shengming Ma
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, P. R. China.
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717
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Ma S, Gao W. Tuning the reaction paths in palladium(0)-catalyzed coupling-cyclization reaction of beta-amino allenes with organic halides: a substituent switch. Org Lett 2002; 4:2989-92. [PMID: 12182606 DOI: 10.1021/ol026406t] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] Substituent effects on the allene moiety and the N-protecting group were found to be the dominant factor in determining the reaction paths in the Pd(0)-catalyzed coupling-cyclization reaction of beta-amino allenes with organic halides.
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Affiliation(s)
- Shengming Ma
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, P. R. China.
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718
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A novel direct catalytic asymmetric synthesis of cyclic indole derivatives by intramolecular carbopalladation of allenes and subsequent intramolecular amination. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0957-4166(02)00359-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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719
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Ma S, Yu Z. Oxidative Cyclization-Dimerization Reaction of 2,3-Allenoic Acids and 1,2-Allenyl Ketones: An Efficient Synthesis of 4-(3′-Furanyl)butenolide Derivatives. Angew Chem Int Ed Engl 2002; 41:1775-8. [DOI: 10.1002/1521-3773(20020517)41:10<1775::aid-anie1775>3.0.co;2-8] [Citation(s) in RCA: 128] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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720
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Ma S, Yu Z. Oxidative Cyclization-Dimerization Reaction of 2,3-Allenoic Acids and 1,2-Allenyl Ketones: An Efficient Synthesis of 4-(3′-Furanyl)butenolide Derivatives. Angew Chem Int Ed Engl 2002. [DOI: 10.1002/1521-3757(20020517)114:10<1853::aid-ange1853>3.0.co;2-k] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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721
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Canovese L, Visentin F, Chessa G, Santo C, Uguagliati P, Bandoli G. The marked influence of steric and electronic properties of ancillary pyridylthioether ligands on the rate of allene insertion into the palladium–carbon bond. J Organomet Chem 2002. [DOI: 10.1016/s0022-328x(02)01145-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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722
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Alcaide B, Almendros P, Aragoncillo C. Additions of allenyl/propargyl organometallic reagents to 4-oxoazetidine-2-carbaldehydes: novel palladium-catalyzed domino reactions in allenynes. Chemistry 2002; 8:1719-29. [PMID: 11933100 DOI: 10.1002/1521-3765(20020402)8:7<1719::aid-chem1719>3.0.co;2-u] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Metal-mediated carbonyl allenylation and propargylation of 4-oxoazetidine-2-carbaldehydes were investigated in aqueous environment. Different propargyl bromide and metal promoters showed varied regio- and stereoselectivities on product formation. In addition, an unprecedented one-pot stereoselective synthesis of beta-chlorinated allylic alcohols, which can also be considered as functionalized allylsilanes, has been developed, which involves tin(IV) chloride-mediated reaction of propargyltrimethylsilane and 4-oxoazetidine-2-carbaldehydes. Some of the resulting coupling products were submitted to transition metal catalyzed reactions, such as the allenic Pauson-Khand and palladium-catalyzed reactions, leading to novel fused or bridged tricyclic beta-lactams. Remarkably, a novel domino process, namely the allene cyclization/intramolecular Heck reaction was found. A likely mechanism for the cascade reaction should involve an intramolecular cyclization on a (pi-allyl)palladium complex and a Heck-type reaction.
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Affiliation(s)
- Benito Alcaide
- Departamento de Química Orgánica I Facultad de Química Universidad Complutense de Madrid, 28040 Madrid, Spain.
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723
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Grigg R, Khamnaen T, Rajviroongit S, Sridharan V. Synthesis of N-substituted 4-methylene-3,4-dihydro-1(2H)-isoquinolin-1-ones via a palladium-catalysed three-component process. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00329-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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724
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Huang TH, Chang HM, Wu MY, Cheng CH. Palladium-catalyzed three-component assembling of allenes, organic halides, and arylboronic acids. J Org Chem 2002; 67:99-105. [PMID: 11777445 DOI: 10.1021/jo010637g] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient method for the construction of two carbon-carbon bonds in a regio- and stereoselective fashion via palladium-catalyzed assembling of allenes, organic halides, and arylboronic acids is described. Organic halides (RI = C(6)H(5)I, o-, m-, and p-CH(3)OC(6)H(4)I, p-C(2)H(5)OCOC(6)H(4)I, p-CH(3)COC(6)H(4)I, p-CH(3)C(6)H(4)I, p-CH(3)C(6)H(4)Br, p-CH(3)C(6)H(4)Cl, p-NO(2)C(6)H(4)I, p-NO(2)C(6)H(4)Br, p-NO(2)C(6)H(4)Cl, p-IC(6)H(4)Cl, 1-iodonaphthalene, 2-iodothiophene, 3-iodo-2-cyclopenten-1-one, 3-iodo-5,5-dimethyl-2-cyclohexen-1-one, C(6)Eta(5)(Br)C=CH(2) and ICH(2)CO(2)C(2)H(5)), and arylboronic acids (ArB(OH)(2), Ar = C(6)H(5), p-CH(3)OC(6)H(4), m-NO(2)C(6)H(4), p-FC(6)H(4), 1-C(10)H(7), and o-, m-, and p-CHOC(6)H(4)) undergo Suzuki-type three-component assembling with 1,1-dimethylallene to give the corresponding allylic derivatives, (CH(3))(2)=CRCH(2)Ar, in DMF at 70 degrees C in the presence of CsF using Pd(dba)(2) as the catalyst. Higher yields of products were obtained for aryl iodides than for the corresponding aryl bromides and chlorides. This three-component assembling is highly regioselective, with the organic group on halides adding to the middle carbon and the aryl group on arylboronic acids to the unsubstituted terminal carbon of allenes. Monosubstituted allenes 1b-e (cyclopentylallene, cyclohexylallene, tert-butylallene, and n-butylallene) also undergo similar assembling reaction with organic halides and arylboronic acids to afford the corresponding products 7a-i with high regio- and stereoselectivity. Based on the known palladium chemistry, a mechanism is proposed to account for the catalytic reaction and the stereochemistry.
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725
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Rode JE, Dobrowolski JC, Borowiak MA, Mazurek AP. A theoretical study on the stability and spectra of cycloaddition products: Methylene-β-lactam isomers. Phys Chem Chem Phys 2002. [DOI: 10.1039/b200625c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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726
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Shibata T, Shibata T, Kadowaki S, Takagi K. Palladium-catalyzed Synthesis of 2,2-Dimethyl-3-pyrrolines from a-Aminoallene and Aryl Iodides. HETEROCYCLES 2002. [DOI: 10.3987/com-02-9594] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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727
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Oh C, Yoo HS, Jung SH. Palladium-Catalyzed Reductive Dimerizations of Highly Functionalized Allenes. CHEM LETT 2001. [DOI: 10.1246/cl.2001.1288] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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728
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Dondas H, Balme G, Clique B, Grigg R, Hodgeson A, Morris J, Sridharan V. Synthesis of heterocycles via sequential Pd/Ru-catalysed allene insertion–nucleophile incorporation–olefin metathesis. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01810-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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729
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Löfstedt J, Franzén J, Bäckvall JE. Carbon-carbon bond formation in regio- and stereoselective palladium-catalyzed cyclization of allene-substituted conjugated dienes. J Org Chem 2001; 66:8015-25. [PMID: 11722199 DOI: 10.1021/jo0157324] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Regio- and stereoselective palladium-catalyzed reactions of allene-substituted 1,3-dienes 1 in acetic acid at room temperature lead to cyclization with formation of a carbon-carbon bond between the middle carbon of the allene and the terminal carbon of the 1,3-diene. Two different types of reactions, both that constitute 1,4-carboacetoxylations of the 1,3-diene, have been developed. In one of the reactions, Pd(II) catalyzes the oxidation of 1 to bicyclic compounds 2, and in the other, Pd(0) catalyzes the transformation of 1 to bicyclic compounds 3. The products 2 are useful for further synthetic transformations and undergo Diels-Alder reactions with dienophiles to give polycyclic ring systems.
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Affiliation(s)
- J Löfstedt
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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730
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Horváth A, Bäckvall JE. Palladium(II)-catalyzed S(N)2' reactions of alpha-allenic acetates. Stereoconvergent synthesis of (Z,E)-2-bromo-1,3-dienes. J Org Chem 2001; 66:8120-6. [PMID: 11722214 DOI: 10.1021/jo015950x] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of acetylated alpha-allenic alcohols with LiBr in the presence of 1.5 mol % of Pd(OAc)(2) provides easy access to substituted (Z,E)-2-bromo-1,3-dienes in good yields with excellent diastereoselectivity. Both secondary and tertiary acetates as well as terminal and nonterminal allenes were studied to investigate the scope and the limitations of the reaction. A mechanism is proposed to clarify how a diastereomeric mixture of the starting compound is transformed into a single diastereomer of the product.
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Affiliation(s)
- A Horváth
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91, Stockholm, Sweden
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731
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Liu G, Lu X. Palladium(II)-catalyzed tandem reaction of intramolecular aminopalladation of allenyl N-tosylcarbamates and conjugate addition. Org Lett 2001; 3:3879-82. [PMID: 11720559 DOI: 10.1021/ol016727p] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A divalent palladium-catalyzed tandem cyclization-coupling reaction of allenyl N-tosylcarbamates and acrolein was developed. The reaction gave aldehyde-functionalized 2-oxazolidinones in one step with high regioselectivity. A mechanism involving intramolecular aminopalladation of allene, followed by insertion of alkene and C-Pd bond protonolysis, is proposed. [reaction: see text]
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Affiliation(s)
- G Liu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
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732
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Grigg R, Kongkathip N, Kongkathip B, Luangkamin S, Dondas H. Palladium catalysed reaction of allene with phenols. Phenoxymethyl-1,3-dienes and their further reactions. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00771-2] [Citation(s) in RCA: 18] [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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733
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Shin S, RajanBabu TV. Regio- and stereochemical control in bis-functionalization-cyclization: use of alleneyne precursors for carbocyclic and heterocyclic synthesis. J Am Chem Soc 2001; 123:8416-7. [PMID: 11516299 DOI: 10.1021/ja011281t] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S Shin
- Department of Chemistry, The Ohio State University, Columbus, OH 43210, USA
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734
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Shen Q, Hammond GB. Highly efficient synthesis of 1,1-difluoro-2-substituted-1,3-dienes and dienynes from gem-difluorohomoallenyl bromide via palladium-catalyzed cross-coupling reactions. Org Lett 2001; 3:2213-5. [PMID: 11440582 DOI: 10.1021/ol0160654] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] A stable gem-difluoroallenylindium 1 is readily transformed to a potentially bifunctional electrophile 2, which can then undergo a transition-metal-promoted isomerization-cross-coupling cascade to yield diene 3 and dienyne 4 in very high yields.
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Affiliation(s)
- Q Shen
- Department of Chemistry and Biochemistry, University of Massachusetts Dartmouth, North Dartmouth, Massachusetts 02747, USA
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735
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Synthesis of tetrasubstituted furans by sequential SmI2-promoted reduction and Pd-catalyzed cyclization. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00574-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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736
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Karstens WF, Klomp D, Rutjes FP, Hiemstra H. N -Acyliminium ion chemistry and palladium catalysis: a useful combination to obtain bicyclic heterocycles. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00364-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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737
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Grigg R, Kordes M. Synthesis of Cyclopropanes by Intramolecular Attack ofN-Nucleophiles on the Central Carbon of (π-Allyl)palladium Complexes. European J Org Chem 2001. [DOI: 10.1002/1099-0690(200102)2001:4<707::aid-ejoc707>3.0.co;2-i] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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