Zobrazeno 1 - 10
of 134
pro vyhledávání: '"Pierre Crabbé"'
Autor:
Pierre Crabbé, J. Romo
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 72:208-221
The synthesis of 16β-hydroxymethyl-17α-Δ5-pregnene-3β-ol-20-one (IV) and 16β-hydroxymethyl-isoprogesterone (IXa) is described. The configuration assigned to these substances and their derivatives is based on rotatory dispersion, nuclear magnetic
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 87:369-374
A series of heterocuprates CH3 (RY)CuLi, prepared from mono- or bi-functional chiral inductors, were reacted with cyclohexen-2 one. Whereas no asymmetric induction was observed in the presence of chiral alcohols, enantiomeric excesses varying from
Autor:
Pierre Crabbé, J. A. Zderic
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 70:403-409
The diacetylenic steroids (VI), (VII) and (X) have been prepared by the cupric acetate — pyridine method. The “bis-norlutine” (VI) has been partially hydrogenated to the corresponding “diene” (VIII) and the “bis-acetate” (X a) has been
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 71:203-216
The synthesis of certain 3-amino, 6-amino and 17-amino steroids as well as of 3,17- and 3,20-bis-amino-steroids is described.
Autor:
G. Gagnaire, M. C. Meana, A. Padilla, Jean-Pierre Deprés, Alicia Cruz, A. E. Greene, Eliezer J. Barreiro, Pierre Crabbé, L. Williams, H. Sook Choi
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 86:109-124
The preparation of novel prostaglandin analogues from PGA2, isolated from marine corals, is outlined. The synthesis of prostaglandins that contain a cyclobutane instead of the cyclopentane ring is described. In addition, a detailed account of the tot
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 70:271-284
A new nine steps synthesis of the 21-acetate 6α-fluoro 16α-hydroxy substance S 16α, 17α-acetonide (XVII) is described. This compound is a key intermediate in the synthesis of the high anti-inflammatory hormone (XIX).
Autor:
Elmer O. Schlemper, Pierre Crabbé
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 92:275-287
The X-ray crystal structure determinations of levonorgestrel (1) and its esters (2) to (7) have been performed in order to assign the molecular features and attempt to correlate the conformation of the molecules with their long-acting contraceptive a
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 70:168-188
Investigation of Iresine pringlei led to the identification of the pentacyclic triterpene friedelin (III) (in the stem), ceryl alcohol (IV), as well as the steroids stigmastanol (VIII), stigmasterol (XI), β-sitosterol (V) and α-spinasterol (XII). F
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 67:632-641
Au cours de l'isolement de l'iresine (I) a partir de Iresine celosioides L, un examen minutieux des extraits a permis de deceler la presence de trois sesquiterpenes apparentes. En plus de la dihydroiresine (VI) deja connue, la dihydroiresone (III) et
Autor:
Pierre Crabbé
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 70:189-192
The benzil (VI) has been obtained by alkaline degradation of isoflavone. (I). A mechanism for the formation of (VI) is discussed.