Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2017, Issue 43, Pages 6450-6456Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201701296
Keywords
Alkynes; Azides; Nitrogen heterocycles; Click chemistry; Propellane; Cage compounds
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Syntheses of bicyclo[1.1.1]pentane-derived azides and terminal alkynes - interesting substrates for click reactions - are described. With a few exceptions, these compounds were prepared in two or three steps starting from common synthetic intermediates - the corresponding carboxylic acids. The key step in the synthesis of 1-azidobicyclo[1.1.1]pentanes is a copper-catalysed diazo-transfer reaction with imidazole-1-sulfonyl azide. The preparation of bicyclo[1.1.1]pentyl-substituted alkynes relies on a Seyferth-Gilbert homologation with dimethyl 1-diazo-2-oxopropylphosphonate (Ohira-Bestmann reagent). Both types of target compounds were found to be suitable substrates for click reactions, and thus they are promising building blocks for medicinal, combinatorial and bioconjugate chemistry. A practically important side result of this study was a multigram preparation of Boc-monoprotected 1,3-diaminobicyclo[1.1.1]pentane - a representative bicyclic conformationally restricted diamine derivative.
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