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Diastereoselective Three-Center Michael Addition of β-Ketoesters to Prostereogenic α,β-Unsaturated Carbonyl Compounds Catalyzed by K2CO3 or Cs2CO3

✍ Scribed by Nicole Ouvrard; Dr. Jean Rodriguez; Prof. Dr. Maurice Santelli

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 353 KB
Volume: 31
Category: Article
ISSN: 0044-8249
DOI: 10.1002/anie.199216511

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✦ Synopsis

clear, colorless, coffin-shaped crystals (0.22 x 0.50 x 0.55 mm3) were obtained by isotropic distillation of pentane into a solution of 6 in chloroform. Enraf-Nonius CAD-4 fourcircle diffraclometer, 29,,, = 52 O , 201 5 symmetry-independent reflectiona, of which 1286 with FZ > 3u(F2) were used for the refinement (SHELXS): 166 refined parameters. R = 0.033, R, = 0.041, M.-' = uZ(F,). Further details of the crystal structure investigation may be obtained from the Fachinformationszentrum Kdrlsruhe. Gesellschaft fur wissenschaftlich-technische Information GmbH, D-W-7514 Eggenstein-Leopoldshafen 2 (FRG) on quoting the depository number CSD-56676, the names of the authors, and the journal citation. [I91 J. L. Hencher in The Climnistrj. of the FuncrionulGroups, The Chemistry of' rhr Curhon Crrrhon Triple Bond, Purr I (Ed.: S.

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