1
|
Synthesis of 4,5-Disubstituted Benzo[c][2,7]naphthyridines by Combined Metalation-Palladium-Catalysed Cross-Coupling Strategies. Preparation of 8h-Pyrido[4,3,2-mn]acridone as a Model of Cystodytin Alkaloids. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397919608003845] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
2
|
Ortho-directed metallation of π-deficient heterocycles in connection with palladium-catalyzed biaryl cross-coupling Synthesis of marine alkaloids of the pyridoacridine series. CAN J CHEM 2001. [DOI: 10.1139/v01-147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Connection between ortho-directed metallation of π-deficient heterocycles and Suzuki cross-coupling reactions provides a very efficient and fruitful strategy to polycyclic molecules of biological interest. The methodology is used to synthesize alkaloids or precursors and analogues of natural compounds of the pyrido[2,3,4-k,l]acridine series.Key words: marine alkaloids, pyrido[2,3,4-k,l]acridines, metallation, cross-coupling.
Collapse
|
3
|
Reactivity of 4-chlorobenzo[c][2,7]naphthyridines towards Pd(0) catalyzed coupling reactions and nucleophilic substitutions. aroylation by nucleophilic substitution with analogues of acyl anions. J Heterocycl Chem 2001. [DOI: 10.1002/jhet.5570380505] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
4
|
Abstract
The first synthesis of phenylpyridine analogues of rhazinilam and evaluation of these new structures as inhibitors of microtubule disassembly by interaction with tubulin are described. The synthesis is based on such key steps as picolinic metalation, hetero-ring cross-coupling and reduction of an acetyl group to an ethyl group. Elaboration of a quaternary picolinic carbon is one of the challenges of the synthesis. Biological evaluation of compounds bearing a quaternary picolinic carbon showed interactions with tubulin similar to (-)-rhazinilam but at a lower level.
Collapse
|
5
|
New synthesis of benzo-delta-carbolines, cryptolepines, and their salts: in vitro cytotoxic, antiplasmodial, and antitrypanosomal activities of delta-carbolines, benzo-delta-carbolines, and cryptolepines. J Med Chem 2001; 44:949-60. [PMID: 11300877 DOI: 10.1021/jm0010419] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The paper describes, in its first part, a new synthesis of benzo-delta-carbolines, cryptolepines, and their salts. The strategy is based on the association between halogen-dance and hetero-ring cross-coupling. It is fully convergent and regioselective with interesting overall yields from 27% to 70%. A halogen-dance mechanism in quinoline series is also proposed. The formal synthesis of potential antimalarial compounds and the first total synthesis of 11-isopropylcryptolepine are also described. In the second part, cytotoxic activity against mammalian cells and activities against Plasmodium falciparum and Trypanosoma cruzi of benzo-delta-carbolines and delta-carbolines were evaluated in vitro to study the structure-activity relationships. For benzo-delta-carbolines, methylation at N-5 increases the cytotoxic and antiparasitic activities. A further alkylation on C-11 generally increases the cytotoxic activity but not the antiparasitic activity, cryptolepine and 11-methylcryptolepine being the most active on both parasites. Taking advantage of the fluorescence of the indoloquinoline chromophore, cryptolepine was localized by fluorescence microscopy in parasite DNA-containing structures suggesting that these compounds act through interaction with parasite DNA as proposed for cryptolepine on melanoma cells. For delta-carbolines, methylation at N-1 is essential for the antimalarial activity. 1-Methyl-delta-carboline specifically accumulates in the intracellular parasite. It has weak cytotoxic activity and can be considered as a potential antimalarial compound.
Collapse
|
6
|
Ortho-directed metallation of π-deficient heterocycles in connection with palladium-catalyzed biaryl cross-coupling Synthesis of marine alkaloids of the pyridoacridine series. CAN J CHEM 2001. [DOI: 10.1139/cjc-79-11-1754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
7
|
Diastereoselective protonation of lactam enolates derived from (R)-phenylglycinol. A novel asymmetric route to 4-phenyl-1,2,3, 4-tetrahydroisoquinolines. Org Lett 2000; 2:2185-7. [PMID: 10930239 DOI: 10.1021/ol0057939] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Highly diastereoselective protonation of chiral lactam enolates of 4-substituted-1,4-dihydroisoquinolin-3-ones is reported. Protonation and alkylation processes of these lactam enolates derived from phenylglycinol occur with opposite diastereofacial selectivity. This diastereoselective protonation has been applied to the asymmetric synthesis of (4S)-N-methyl-4-phenyl-1,2,3,4-tetrahydroisoquinoline 9 obtained in up to 97% ee.
Collapse
|
8
|
Synthesis of 4,8-Diarylcinnolines and Quinazolines with Potential Applications in Nonlinear Optics. Diazines. Part 28. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00448-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
9
|
Synthesis of 4-(2-diphenylphosphino-1-naphthyl)-2-phenylquinazoline; a potential PN chelating ligand for asymmetric catalysis. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)01648-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
10
|
Synthesis of 4,5-disubstituted benzo[c][2,7]naphthyridines as precursors of pyrido[2,3,4-kl]acridones and related natural products. J Heterocycl Chem 1999. [DOI: 10.1002/jhet.5570360508] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
11
|
Synthesis of Chiral Diazine and Pyridine Sulfoxides. Asymmetric Induction by Chiral Sulfoxides in an “Aromatic Ortho-Directed Metalation−Reaction with Electrophiles Sequence”. Diazines. 24. J Org Chem 1999. [DOI: 10.1021/jo981125d] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
12
|
|
13
|
|
14
|
|
15
|
Synthesis of new pyridine intermediates as precursors for the elaboration of streptonigrin analogues by the metalation-cross-coupling strategy. J Heterocycl Chem 1996. [DOI: 10.1002/jhet.5570330670] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
16
|
Metallation in connection with cross-coupling reactions. Coupling of hindered aryls for the synthesis of 4-phenylpyridines as part of Streptonigrin and Lavendamycin analogues. J Organomet Chem 1996. [DOI: 10.1016/0022-328x(95)05979-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
17
|
Metallation of diazines XIV. First O-directed metallation of cinnolines. Metallation of 3-, 4-chloro and 3-, 4-methoxycinnolines. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)00835-v] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
18
|
Regioselectivity of the metalation of polymethoxylated pivaloyl-aminobenzenes. Synthesis of methoxy-2(1H)-quinolones precursors of 2-substituted-5,8-quinolinediones. J Heterocycl Chem 1995. [DOI: 10.1002/jhet.5570320411] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
19
|
A new route to 5,6-diarylpyridazin-3-ones by metalation and cross-coupling of pyridazines. J Heterocycl Chem 1995. [DOI: 10.1002/jhet.5570320364] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
20
|
Metalation of diazines.XI. Directedortho-lithiation of fluoropyrimidines and application to synthesis of an azacarboline. J Heterocycl Chem 1994. [DOI: 10.1002/jhet.5570310602] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
21
|
A new route to arglecin by metalation and cross coupling of pyrazines. Metalation of diazines. XII. J Heterocycl Chem 1994. [DOI: 10.1002/jhet.5570310627] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
22
|
|
23
|
|
24
|
New Synthesis of the Streptonigrin Quinoline-5,8-quinone Moiety and Aromatic Cross-Coupling. Synlett 1994. [DOI: 10.1055/s-1994-22807] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
25
|
|
26
|
Metalation of diazines.VI. Metalation of pivaloylaminopyrazine andN-t-butylpyrazinamide. Unusual regioselectivity in the metalation reaction. J Heterocycl Chem 1992. [DOI: 10.1002/jhet.5570290404] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
27
|
|
28
|
Metallation of diazinesII. First metallation of pyridazine, metallation of 2,4-dichloropyrimidine. J Heterocycl Chem 1990. [DOI: 10.1002/jhet.5570270536] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
29
|
|
30
|
Synthesis ofortho-substituted aminopyridines. Metalation of pivaloylamino derivatives. J Heterocycl Chem 1989. [DOI: 10.1002/jhet.5570260119] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
31
|
|
32
|
A New Route to 2,3-Disubstituted Pyrazines; Regioselective Metalation of Chloropyrazine. SYNTHESIS-STUTTGART 1988. [DOI: 10.1055/s-1988-27736] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
33
|
Directed lithiation of 4-halopyridines: Chemoselectivity, regioselectivity and application to synthesis. J Heterocycl Chem 1988. [DOI: 10.1002/jhet.5570250112] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
34
|
|
35
|
|
36
|
Regioselective Lithiation of 3-Pyridylsulfonic Acid Derivatives: A Convenient Route to Various New 4-Substituted 3-Pyridylsulfonamides. SYNTHESIS-STUTTGART 1983. [DOI: 10.1055/s-1983-30528] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
37
|
|
38
|
ortho-Functionalization of Aminopyridines; Regioselective Lithiation of 3-Pivaloylaminopyridines. SYNTHESIS-STUTTGART 1982. [DOI: 10.1055/s-1982-29855] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
39
|
Regioselectiveo-Lithiation of 3-Alkoxypyridines; A Convenient Route to Newo-Disubstituted Pyridines. SYNTHESIS-STUTTGART 1982. [DOI: 10.1055/s-1982-29762] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
40
|
|