Regioselective Deiodination of Thyroxine by Iodothyronine Deiodinase Mimics: An Unusual Mechanistic Pathway Involving Cooperative Chalcogen and Halogen Bonding
作者:Debasish Manna、Govindasamy Mugesh
DOI:10.1021/ja210478k
日期:2012.3.7
Iodothyroninedeiodinases (IDs) are mammalian selenoenzymes that catalyze the conversion of thyroxine (T4) to 3,5,3'-triiodothyronine (T3) and 3,3',5'-triiodothyronine (rT3) by the outer- and inner-ringdeiodination pathways, respectively. These enzymes also catalyze further deiodination of T3 and rT3 to produce a variety of di- and monoiodo derivatives. In this paper, the deiodinase activity of a
Biomimetic deiodination of thyroid hormones and iodothyronamines – a structure–activity relationship study
作者:Santanu Mondal、Govindasamy Mugesh
DOI:10.1039/c6ob01375a
日期:——
ring deiodination of thyroidhormones (THs) and play an important role in maintaining the TH concentration throughout the body. These enzymes also accept the decarboxylated thyroidhormone metabolites, iodothyronamines (TAMs), as substrates for deiodination. Naphthalene-based selenium and/or sulphur-containing small molecules have been shown to mediate the regioselective tyrosyl ring deiodination of
The photolysis of naphtho[1,8-de]-1,3-dichalcogeninylidene 1-oxide derivatives (4 and 5) at >290 nm generates ketenes together with naphtho[1,8-cd]-1,2-dichalcogenole, which were confirmed by the trapping experiments and the direct observation using IR spectroscopy. The generation of ketenes from the selenium compounds 5 is more effective than that from the sulfur analogs 4.
萘并[1,8 - de ] -1,3-二卤代亚苄基1-氧化物衍生物(4和5)在> 290 nm处发生光解,与萘并[1,8 - cd ] -1,2-二卤代庚烯一起生成烯酮。通过捕获实验和使用红外光谱法的直接观察得到了证实。由硒化合物5产生的烯酮比由硫类似物4产生的烯酮更有效。
Synthesis and X-ray structures of new phosphorus–selenium heterocycles with an E–P(Se)–E′ (E, E′ = N, S, Se) linkage
作者:Guoxiong Hua、Amy L. Fuller、Yang Li、Alexandra M. Z. Slawin、J. Derek Woollins
DOI:10.1039/b9nj00570f
日期:——
difunctional aromatic substrates (aryldiamines and aryldithiols) leads to a series of novel five- to seven-membered heterocycles 2a–e, 4a, 4b and 6a–c with an E–P(Se)–E′ (E, E′ = N, S, Se) linkage in 7–98% isolated yields. This method offers a new approach to the library of phosphorus–selenium heterocyclic compounds. All new compounds have been characterized by IR, 1H, 13C, 31P, 77Se NMR, mass spectrometry
peri-bridged naphthalene, dinaphtho[1,8-b,c]-1,5-diselenocin (1), and 1,8-bis(methylseleno)naphthalene (2) have been synthesized. The cyclic voltammogram of 1 and 2 showed one reversible oxidation peak with remarkably low oxidation potential. Selenide 1 in CHCl3 under air and scattered light undergoes oxidation to give the corresponding Se-oxide 11. The peri selenium-selenium interaction of 1 and 2 was