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Volumn 48, Issue 49, 2007, Pages 8636-8642

Asymmetric lithiation of 2-alkynyl aryl sulfides-Enantio- and diastereoselective formation of allenyl aryl sulfides and their application in nickel-catalyzed cross-coupling reactions

Author keywords

Allenes; Asymmetric synthesis; Carbanions; Cross coupling reaction; Lithiation

Indexed keywords

ALLENYL 2 PYRIDINYL SULFIDE DERIVATIVE; LITHIUM; NICKEL; SULFIDE; UNCLASSIFIED DRUG;

EID: 36148941396     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2007.10.037     Document Type: Article
Times cited : (10)

References (82)
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    • An asymmetric transformation describes the conversion of a racemate into a pure enantiomer or into a mixture in which one enantiomer is present in excess, or of a diastereomeric mixture into a single diastereoisomer or into a mixture in which one diastereomer predominates. If the two enantiomers of a chiral substrate A are freely interconvertible, and if an equal amount of excess of a non-racemizing second enantiomerically pure chemical species, say (R)-B, is added to a solution of racemic A, then the resulting equilibrium mixture of adducts A·B will, in general, contain unequal amounts of diastereoisomers (R)-A·(R)-B and (S)-A·(R)-B. The result of this equilibration is called asymmetric transformation of the first kind. See. In: McNaught A.D., and Wilkinson A. (Eds).IUPAC Compendium of Chemical Terminology. 2nd ed. (1997), Blackwell Science
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    • note
    • Data sets were collected with a Nonius KappaCCD diffractometers. Programs used: data collection COLLECT (Nonius B. V., 1998), data reduction Denzo-SMN (Otwinowski, Z.; Minor, W. Methods in Enzymology 1997, 276, 307-326), absorption correction Denzo (Otwinowski, Z.; Borek, D.; Majewski, W.; Minor, W. Acta Crystallogr. 2003, A59, 228-234), structure solution shelxs-97 (Sheldrick, G. M.; Acta Crystallogr. 1990, A46, 467-473), structure refinement shelxl-97 (Sheldrick, G. M. Universität Göttingen, 1997), graphics SCHAKAL (Keller, E. Universität Freiburg, 1997). CCDC 656888 (11a) and CCDC 656889 (16aa) contain the supplementary crystallographic data for this Letter. These data can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html [or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: (internat.) +44 (1223) 336 033, e-mail: deposit@ccdc.cam.ac.uk].
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    • note
    • -3, hydrogen atoms calculated and refined as riding atoms.
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    • note
    • 3 over a period of 10 min compared to the addition at once) showed no evidence for dynamic kinetic resolution.
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    • The corresponding titanated S-2-alkynyl thiocarbamates and O-2-alkynyl carbamates 2 are configurationally stable at -78 °C.
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    • note
    • 3 up to 4 h.
  • 78
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    • note
    • 16b failed.
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    • note
    • The configuration of the double bond was determined by NOE-experiments.
  • 80
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    • NMR analysis of the crude product gave no hints for the existence or non-existence of a second diastereomer.
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    • note
    • -3, hydrogen atoms calculated and refined as riding atoms.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.