Results 181 to 190 of about 20,891 (238)

Pyrane, 84. Hexahydrobenzotripyrane

Liebigs Annalen der Chemie, 1980
AbstractDie Hexahydrobenzotripyrane 5 und 6 lassen sich durch katalytisches Hydrieren des Benzotripyranons 3 gewinnen, die weniger symmetrischen Isomere 21 und 12 aus der 1,2,4‐Benzoltriyltris(3‐oxypropionsäure) 16c durch Ringschlußreaktionen sowie katalytisches Hydrieren.
Claus Schmiz, Fritz Eiden
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2H-pyrans (review)

Chemistry of Heterocyclic Compounds, 1985
Data on methods of synthesis, transformations, and spectroscopy of monocyclic six-membered, oxygen-containing heterocycles, viz., 2H-pyrans, are correlated and systematized for the first time in this review.
O. V. Drygina, A. D. Garnovskii, A. V. Kazantsev   +2 more
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ChemInform Abstract: PYRANS, 100. 5,6‐DIHYDRO‐2H‐PYRAN‐3(4H)‐ONE AS A SYNTHON FOR PYRAN‐ANNULATED HETEROCYCLIC COMPOUNDS

Chemischer Informationsdienst, 1985
AbstractDihydropyranon (I) läßt sich nur in Einzelfällen,′ z.B. mit den Aminoketonen (XX), zu anellierten Heterocyclen wie (XXI) umsetzen.
F. EIDEN, K. T. WANNER
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Strategies for the synthesis of bioactive pyran naphthoquinones

Organic & Biomolecular Chemistry, 2010
Taking into account the numerous reports in the literature related to pyran naphthoquinones in searching for new pharmacologically promising molecules against different therapeutic targets, this review intends to explore the synthetic methodologies for preparing these bioactive compounds.
Vitor Francisco, Ferreira, Sabrina Baptista, Ferreira, Fernando de Carvalho, da Silva   +2 more
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Pyrans, Thiopyrans, and Selenopyrans

1983
Publisher Summary This chapter presents the literature for pyrans, thiopyrans, and selenopyrans. Pyran structure refers to a six-membered ring possessing one oxygen, sulfur, selenium, or telurium heteroatom singly bonded in a cyclic system of two double bonds and one tetrahedral atomic center.
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Immunopharmacology of pyran copolymer

Pharmacological Research Communications, 1978
P, Puccetti, A, Giampietri
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Stereoselective synthesis of the pyran subunit of portentol

Organic & Biomolecular Chemistry
A concise synthesis of the pyran core of portentol was established in nine steps, involving an asymmetric lactate-anti-aldol reaction, selective lactol formation and a Corey–Winter elimination that proceeds with excellent diastereoselectivity.
Tan Hoang Luu, Florian Heppner, Johal Ruiz, Dirk Menche   +3 more
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Pyran derivatives

Il Farmaco, 2003
Mario Di Braccio, Giancarlo Grossi, Giorgio Roma, Cristina Marzano, Franca Baccichetti, Morena Simonato, Franco Bordin   +6 more
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Pyrans and Fused Pyrans: (i) Structure

1984
P.J. Brogden, C.D. Gabbutt, J.D. Hepworth   +2 more
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Aroxydihydro pyrans

Chemistry of Heterocyclic Compounds, 1970
G. G. Skvortsova, V. G. Kozyrev
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