Palladium-catalysed Claisen rearrangement of 6-allyloxypurines
-
Petr Koukal
,
Hana Dvořáková
Abstract
6-Allyloxypurines readily undergo palladium-catalysed Claisen rearrangement under mild conditions affording N 1-substituted hypoxanthines. In contrast with the previously reported protocol, the Claisen rearrangement can be performed using Pd(PPh3)4 or Pd(dba)2/dppf in dry THF at 60°C. The reaction can accommodate variously substituted allyl fragments to position N 1 of the hypoxanthine skeleton with high yields. Retention of the double bond configuration during rearrangement was observed.
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© 2012 Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
- Professor Dr. Štefan Toma—excellent scientist and teacher—celebrates his 75th birthday
- Palladium-catalysed Claisen rearrangement of 6-allyloxypurines
- Applicability of photochemically generated pendant benzoyl peroxides in both “grafting from” and “grafting to” techniques
- Spectral characterisation of new organic fluorescent dyes with an alkoxysilane moiety and their utilisation for the labelling of layered silicates
- Substituted homoallenyl aldehydes and their derivatives. Part 1: Homoallenyl aldehydes and protected hydrazones
- Substituted homoallenyl aldehydes and their derivatives. Part 2: Azines
- Methyltrioxorhenium-catalysed oxidation of secondary amines to nitrones in ionic liquids
- Thiophenium-ylides: Synthesis and reactivity
- Aminohydroxylation of divinylcarbinol and its application to the synthesis of bicyclic hydroxypyrrolidine and aminotetrahydrofuran building blocks
- Novel quercetin derivatives: synthesis and screening for anti-oxidant activity and aldose reductase inhibition
- Total synthesis of N,O,O,O-tetraacetyl-d-ribo-phytosphingosine and its 2-epi-congener
- A concise synthesis of enantiomerically pure aroyl-l-alanines and dihydroaroyl-l-alanines
- Synthesis and properties of macrocyclic diazene switch with binaphthalene unit attached via acrylamide linkers
- Conjugated push-pull salts derived from linear benzobisthiazole: preparation and optical properties
- Effect of reactants’ concentration on the ratio and yield of E,Z isomers of isatin-3-(4-phenyl)semicarbazone and N-methylisatin-3-(4-phenyl)semicarbazone
