Results 131 to 140 of about 9,122 (180)

Upadacitinib for Induction of Remission in Pediatric Ulcerative Colitis: An International Multicenter Study. [PDF]

J Crohns Colitis
Yerushalmy-Feler A, Spencer EA, Dolinger MT, Suskind DL, Mitrova K, Hradsky O, Conrad MA, Kelsen JR, Uhlig HH, Tzivinikos C, Ancona S, Wlazlo M, Hackl L, Shouval DS, Bramuzzo M, Urlep D, Olbjorn C, D'Arcangelo G, Pujol-Muncunill G, Yogev D, Kang B, Gasparetto M, Rungø C, Kolho KL, Hojsak I, Norsa L, Rinawi F, Sansotta N, Magen Rimon R, Granot M, Scarallo L, Trindade E, Velasco Rodríguez-Belvís M, Turner D, Cohen S.   +34 more
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Research Progress on the Effect of <i>Thesium chinense Turcz.</i> on Neurodegenerative Diseases. [PDF]

Int J Mol Sci
Li Z, Zhao Y, Wang R, Zhou R, Chen X, Jiang J, Dai Y, Luo H.   +7 more
europepmc   +1 more source

Leveraging molecular graphs for natural product classification. [PDF]

Comput Struct Biotechnol J
Prete AL, Corradini BT, Costanti F, Scarselli F, Bianchini M.   +4 more
europepmc   +1 more source

N-heterocyclic analogues of steroids

, 1976
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Heterocyclic Steroids

2023
Steroids are organic compounds with four rings arranged in a precise molecular configuration and are involved in many biological functions displaying a wide spectrum of biological activities and diverse chemical reactivities. Structural modifications of the steroidal rings have attracted a considerable amount of attention recently.
Mukesh M. Mudgal, Mangesh M. Mudgal
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Heterocyclic steroids. Steroidal pyrimidines

Experientia, 1963
Die erste Synthese eines Steroid-Analogen, in welchem Ring A zu einem Pyrimidin umgewandelt wurde, wird beschrieben. Die wichtigste Zwischenstufe 4b wurde durch Abbau von 19-nor-Testosteron gewonnen. Kondensation von 4b mit Thioharnstoff fuhrte zu 17β-Acetoxy-2,4-diazaestr-4-en-1-on-3-thion (5).
E, CASPI, D M, PIATAK
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Heterocyclic steroids VII

Tetrahedron Letters, 1966
Abstract The acetylester (Ib) has been transformed into several derivatives. The direction of bromination of the 4-ketone under acid conditions has been shown as proceeding toward C-3 by the isolation of bromosteroids (Ic) and V. In addition, the 2-oxa lactone (III) has been prepared.
J.G. Westra, W.N. Speckamp, U.K. Pandit, H.O. Huisman   +3 more
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Heterocyclic steroids: Efficient routes for annulation of pentacyclic steroidal pyrimidines

Steroids, 2020
Steroids are components of cell membranes, signaling molecules and are a type of secondary metabolites as a result of their high impact of biological significance. The present review described the literature reports of pentacyclic steroidal pyrimidines as a type of heterocyclic steroids.
M. Monier, Ahmed El-Mekabaty, Doaa Abdel-Latif, Başak Doğru Mert, Khaled M. Elattar   +4 more
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Polynuclear heterocyclic systems. Part V: Heterocycles related to steroids and C‐nor‐steroids

Recueil des Travaux Chimiques des Pays-Bas, 1968
AbstractThe preparation of 6‐methoxy‐2‐(2′‐oxocyclopentyl‐1‐tetralone (I) and 2‐(2′‐oxocyclopentyl)quinolizidin‐1‐one (II) is described. Diketones I and II have been converted to heterocyclic systems related to steroids and C‐nor‐steroids.
R. van Hes, S. Skolnik, U. K. Pandit, H. O. Huisman   +3 more
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