Stereocontrolled derivatization of 3-methoxyestra-1,3,5(10), n-tetraenes via lewis acid promoted prins reactions, (n=7; 8(9))

  title={Stereocontrolled derivatization of 3-methoxyestra-1,3,5(10), n-tetraenes via lewis acid promoted prins reactions, (n=7; 8(9))},
  author={Hermann K{\"u}nzer and Gerhard Sauer and Rudolf Prof. Dr. Wiechert},
  journal={Tetrahedron Letters},
Synthese von Östronderivaten aus Siloxycyclopropancarbonsäureestern
Synthese of Estrone Derivatives from Siloxycyclopropanecarboxylic Acid Esters Syntheses of new rac-estrone analogues such as 10, 19, 21 and 22 are reported. Key intermediate 3 has been
A Molecular Electron Density Theory Study of the Competitiveness of Polar Diels–Alder and Polar Alder-ene Reactions
The term “pseudocyclic selectivity” is suggested to connote the selective formation of structural isomers through stereoisomeric pseudocyclIC TSs in highly polar processes.
Steroids: reactions and partial synthesis.


Stereoselective Introduction of Steroid Side Chains at C (17) and C (20)
A simple and efficient new method for the highly stereoselective (at C (17) and C (20)) introduction of steroid side chains which are suitably functionalized for further elaboration is presented. The
Über 7‐Methyl‐steroide
Durch Grignard-1.6-Addition wird aus dem 17.20;20.21-Bis-methylendioxy-Δ1.4.6.9>(11)-pregnatetraen-on-(3) das 7ζ-Methyl-17.20; 2021 20.21-bis-methylendioxy-Δ1.5.9(11)-pregnatrien-on-(3) erhalten.
Synthese von 7α‐Methyl‐3‐oxo‐Δ4,9,11‐19‐norandrostatrienen. Über Steroide, 211. Mitteilung
The easy conversion of 3-oxo-Δ5(10),9(11)-19-norsteroids into 3-oxo-Δ4,9,11-19-norsteroids by subsequent treatment with a peracid, aluminium oxide, and boron trifluoride is described.
Protection of hydroxyl groups as tert-butyldimethylsilyl derivatives
There is a need for development of chemical agents to protect hydroxyl groups. The agents developed must combine stability under varying circumstances with susceptibility to easy removal by a
An alternative synthesis of 17β‐hydroxy‐7α‐methyl‐19‐nor‐17α‐pregn‐5(10)‐en‐20‐yn‐3‐one (Org OD 14)
The title compound (4) was prepared starting from 17β,19-dihydroxyandrosta-4,6-dien-3-one 17,19-diacetate (5). Copper-catalyzed conjugate addition of methylmagnesium iodide gave, after hydrolysis,
Synthesis of 11 beta,13 beta- and 13 beta,16 beta-propano steroids: probes of hormonal activity.
Binding affinities of certain of these compounds and substituted 13 beta-propyl derivatives of 17 alpha-ethynyl-17 beta-hydroxygon-4-en-3-one for the uterine cytosol receptor of progesterone are reported, and the origin of the high progestational activity of norgestrel and 11 beta-substituted progestins is discussed.