Convenient and straightforward synthesis of ibrutinib labeled by carbon-13 isotope is reported. Isotopically labeled building block is introduced in the last step of reaction sequence affording sufficient isolated yield (7%) of [13 C6 ]-ibrutinib calculated towards starting commercially available [13 C6 ]-bromobenzene.
Keywords: [13C6]-ibrutinib; carbon-13; cost-effective synthesis; stable isotope labeling.
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