The Synthesis of 13C9-15N-Labeled 3,5-Diiodothyronine and Thyroxine
摘要:
Thyroid hormones undergo extensive metabolism to regulate hormone activity. A labeled thyroid hormone would be useful to track hormone metabolism through various pathways. While radiolabeled thyroid hormones have been synthesized and used for in vivo studies, a stable isotope labeled form of thyroid hormone is required for studying thyroid hormone metabolism by LC-MS/MS, an analytical technique that has certain advantages without the complications of radioactivity. Here we report the synthesis of 13C9-15N-T2 and 13C9-15N-T4, two labeled thyroid hormone derivatives suitable for in vivo LC-MS/MS studies. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) to view the free supplemental file.
visible-light-driven, copper-catalyzed C(sp3)–O coupling of benzylic radicals with phenols is described for the first time. This operationally simple and robust process features mild conditions, broad scope, and high functional-group tolerance, enabling the construction of a diverse range of cyanoalkylated arylethers (33 examples). Key to this protocol is the dual role of copper salt that acts not
The deiodination of L-thyroxine (T4) plays key roles in the thyroidhormone homeostasis. This chemical model study reveals that the modulation of the electronic properties of the iodine atoms in T4 through the phenolic group has a remarkable influence on the regioselectivity of the deiodination.