𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Heilmittelchemische Untersuchungen in der heterocyclischen Reihe. Mitteilung. Pyrazolo-(3,4-d)-pyrimidine

✍ Scribed by P. Schmidt; J. Druey


Publisher
John Wiley and Sons
Year
1956
Tongue
German
Weight
306 KB
Volume
39
Category
Article
ISSN
0018-019X

No coin nor oath required. For personal study only.

✦ Synopsis


Abstract

The synthesis of 4‐ and 6‐substituted 1‐H‐ and 1‐phenyl‐pyrazolo‐(3,4‐d)‐pyrimidines is described. It starts from ethyl ethoxymethylene cyanoacetate from which the 4‐hydroxy‐pyrazolo‐(3,4‐d)‐ pyrimidines can be obtained in two steps through the corresponding 2‐substituted 3‐amino‐4‐carbethoxy‐pyrazoles.


📜 SIMILAR VOLUMES


Heilmittelchemische Studien in der heter
✍ P. Schmidt; K. Eichenberger; M. Wilhelm 📂 Article 📅 1962 🏛 John Wiley and Sons 🌐 German ⚖ 483 KB

## Abstract Condensation of 3‐amino‐4‐carbethoxy‐pyrazoles with nitriles led to a new synthesis of 6‐C‐substituted pyrazolo[3,4‐d]pyrimidines and 6‐amino‐pyrazolo‐[3,4‐b]pyridines. The structure of the new derivatives was established by independent syntheses. The pyrazolo‐pyrimidines can be cleaved

Heilmittelchemische Studien in der heter
✍ P. Schmidt; K. Eichenberger; M. Wilhelm; J. Druey 📂 Article 📅 1959 🏛 John Wiley and Sons 🌐 German ⚖ 468 KB

In unseren letzten Mittcilungcnl) z, berichteten wir iiber die dem Koffein, Theobromin und Theophyllin isomeren Pyrazolo [3,4-d]pyrimidine. In der vorliegenden Arbeit beschreiben wir nun Pyrazolo [3,4-d]pyrimidine, die in 3-und 4-Stellung Aminogruppen tragen. Ihre Herstellung war im Hinblick auf die

Heilmittelchemische Studien in der heter
✍ P. Schmidt; J. Druey 📂 Article 📅 1955 🏛 John Wiley and Sons 🌐 German ⚖ 239 KB

## IIELVETICA CHIMICA ACTA. % u s a m m e n f a s s u ng. Durch Untersuchungen an zwei verschicdeneri Fullkorperkolonnen konnte gezeigt werden, dass die fruher beschriebene Charaktmisicrungsgrosse C S fur eine gegebeno Ammoniak-Rbsorptionskolonne in eincr linearen Beziehung zum Mengenverhaltnis G

Heilmittelchemische Studien in der heter
✍ P. Schmidt; J. Druey 📂 Article 📅 1957 🏛 John Wiley and Sons 🌐 German ⚖ 359 KB

## Abstract The amebicidal activity of the phenanthroline quinones published earlier^2^) and of their derivates described in this paper is discussed. The highest activity was found with 4,7‐phenanthrolino‐5, 6‐ quinone **1** and its monosemicarbazone **3**, which are also active in man. Further der

Heilmittelchemische Studien in der heter
✍ P. Schmidt; J. Druey 📂 Article 📅 1954 🏛 John Wiley and Sons 🌐 German ⚖ 357 KB

## Abstract A new synthesis of 6‐pyridazones starting from three single components is described. The starting materials are (1) and α‐diketone, α‐ketoaldehyde or glyoxal, (2) a carbonic acid having an active methylene group in α‐position, and (3) hydrazine or a monosubstituted hydrazine.