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Volumn 126, Issue 43, 2004, Pages 14095-14104

A synthesis strategy yielding skeletally diverse small molecules combinatorially

Author keywords

[No Author keywords available]

Indexed keywords

AMINO ACIDS; MOLECULAR STRUCTURE; POLYPEPTIDES; PROTEINS; SYNTHESIS (CHEMICAL);

EID: 7444242717     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja0457415     Document Type: Article
Times cited : (173)

References (58)
  • 1
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    • Adapted from the Ph.D. Thesis of Burke, M. D., Harvard University, 2003
    • Adapted from the Ph.D. Thesis of Burke, M. D., Harvard University, 2003.
  • 2
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    • (a) Schreiber, S. L. Science 2000, 287, 1964-1969.
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  • 6
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    • and references therein
    • (a) Weber, L. Curr. Opin. Chem. Biol. 2000, 4, 295-302 and references therein
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    • Weber, L.1
  • 23
    • 7444232958 scopus 로고    scopus 로고
    • note
    • (b) M. Narovlyansky and J. Tallarico are gratefully acknowledged for generously providing all of the macrobeads used in these studies.
  • 25
    • 0030824025 scopus 로고    scopus 로고
    • (b) For a study of the Sharpless dihydroxylation on solid phase, see: Han, H.; Janda, K. Angew. Chem., Int. Ed. Engl. 1997, 36, 1731-1733.
    • (1997) Angew. Chem., Int. Ed. Engl. , vol.36 , pp. 1731-1733
    • Han, H.1    Janda, K.2
  • 26
    • 7444227859 scopus 로고    scopus 로고
    • note
    • In a solution-phase model study, the asymmetric dihydroxylation of a related substrate proceeded with >90% ee. It is unclear why the enantioselectivity was diminished for the solid-phase reaction.
  • 28
    • 7444226704 scopus 로고    scopus 로고
    • note
    • 214) of crude products following cleavage from macrobeads.
  • 29
    • 7444220995 scopus 로고    scopus 로고
    • note
    • 1H NMR-silent and had an isotope pattern in its mass spectrum consistent with an osmium-containing substance was not included in the calculation of the purity of product 35.
  • 30
    • 7444219862 scopus 로고    scopus 로고
    • note
    • 1H NMR nOe studies) likely represents the thermodynamic product (minimization of sterics).
  • 31
    • 0023771943 scopus 로고
    • This reagent was purchased from Moscow MedChemlabs (Moscow, Russia) or synthesized in one step via treatment of 2-furaldehyde with molecular bromine in the presence of aluminum trichloride: Chiarello, J.; Joullié, M. M. Tetrahedron 1988, 44, 41-48.
    • (1988) Tetrahedron , vol.44 , pp. 41-48
    • Chiarello, J.1    Joullié, M.M.2
  • 32
    • 0037866299 scopus 로고    scopus 로고
    • Similar regioselective Sonogashira and Stille couplings have been reported: Bach, T.; Krüger, L. Eur. J. Org. Chem. 1999, 2045-2057.
    • (1999) Eur. J. Org. Chem. , pp. 2045-2057
    • Bach, T.1    Krüger, L.2
  • 38
    • 7444247177 scopus 로고    scopus 로고
    • note
    • 2 in DMA at 115°C, two cycles].
  • 39
    • 7444261204 scopus 로고    scopus 로고
    • note
    • The HWE olefination, reduction, functionalization, and dihydroxylation sequence was also explored with these and related substrates; however, the length of the synthesis pathway precluded the generation of the desired macrobead-bound diols with acceptable macrobead integrity and compound purity.
  • 40
    • 7444227297 scopus 로고    scopus 로고
    • note
    • The stereochemistry at the anomeric carbon of cyclic ketal 46 was tentatively assigned as R on the basis of two-dimensional NOESY and one-dimensional nOe experiments.
  • 42
  • 47
    • 7444230804 scopus 로고    scopus 로고
    • note
    • (a) Epimerization of the potentially labile methyl-bearing stereogenic center in 49 was not observed. This observation is consistent with the lack of epimerization observed with the structurally similar Evans' extended polypropionate (β-ketoimide) reagents.
  • 50
    • 7444236864 scopus 로고    scopus 로고
    • note
    • The olefin geometry was determined via nOe studies.
  • 51
    • 2742513412 scopus 로고    scopus 로고
    • Similar distinct stereochemical outcomes have been observed in the oxidation of an alternative series of furan derivatives: Sayama, S.; Inamura, Y. Heterocycles 1996, 43, 1371-1374.
    • (1996) Heterocycles , vol.43 , pp. 1371-1374
    • Sayama, S.1    Inamura, Y.2
  • 52
    • 7444241827 scopus 로고    scopus 로고
    • note
    • Upon prolonged treatment with acidic reagents, slow degradation of 50 to unidentified byproducts was observed (this degradation was more rapid with CSA than with PPTS).
  • 56
    • 7444241246 scopus 로고    scopus 로고
    • note
    • Jennifer Raggio, Leticia Castro, and John Tallarico are gratefully acknowledged for providing encoding reagents, and for cleaving and analyzing chemical tags.
  • 57
    • 0028135116 scopus 로고
    • Statistical calculations and computer simulations suggest that a multiplicative factor of 3.1 is required to provide 99% confidence of achieving 95% coverage of the complete, theoretical combinatorial matrix for a split-pool synthesis involving four split-pool cycles with 10 pools per cycle: Burgess, K.; Liaw, A. I.; Wang, N. J. Med. Chem. 1994, 37, 2985-2987.
    • (1994) J. Med. Chem. , vol.37 , pp. 2985-2987
    • Burgess, K.1    Liaw, A.I.2    Wang, N.3
  • 58
    • 7444228992 scopus 로고    scopus 로고
    • note
    • Throughout the course of the synthesis, the total mass of macrobeads increased somewhat, reflecting the added mass of the attached compounds. There was also some loss of intact macrobeads throughout the split-pool synthesis due to bead-breakage.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.