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  • Journal
    Digital Access
    Provider
    Version
    ScienceDirect
    v. 1-4, 2012-15.
    ClinicalKey
    v. 1-4, 2012-15.
  • Other
    Körmendi, Klára; Stockhausen, Karlheinz; Durkó, Zsolt; Bozay, Attila; Cage, John; Xenakis, Iannis.
    Contents:
    Klavierstück IX / Karlheinz Stockhausen (8:20)
    Son et lumière / Durkó Zsolt (7:18)
    VII. zongoradarab op. 30b/1 / Bozay Attila (9:27)
    Sonatas and interludes. Nos. V, XIII, XI, XIV-XV / John Cage (12:14)
    Mists / Iannis Xenakis (12:12).
    Print p1984
  • Article
    Lam HY, Schnoes HK, DeLuca HF.
    Steroids. 1977 Nov;30(5):671-7.
    A synthesis of 1alpha-hydroxyergocalciferol (1alpha-hydroxyvitamin D2, a potent analog of vitamin D2, is described. The preparation route involves conversion of ergosterol in two steps (60%) to the known ergosta-4, 6, 22-trien-3-one and dehydrogenation of the triene with SeO2 to ergosta-1,4,6,22-tetraen-3-one (30%). Epoxidation of the tetraenone to the corresponding 1alpha, 2alpha-epoxide followed by Li/NH3 reduction gave ergosta-5,22-diene-1alpha, 3beta-diol in 26% yield from the tetranone. After conversion to the corresponding diacetate and allylic bromination/dehydrobromination 1alpha-acetoxyergosteryl acetate was obtained. Irradiation of this intermediate gave the previtamin which was converted to the new vitamin analog by thermal equilibration and hydrolysis of the acetates. Charcteristic uv, nmr and mass spectral patterns confirmed the structure of the product.
    Digital Access Access Options