14804-39-8Relevant academic research and scientific papers
Medium-Sized Cyclophanes. 43. First Evidence for anti-syn-Ring Inversion under the Nitration of 5,13-Di-tert-butyl-8,16-dimethoxy[2.2]metacyclophane
Yamato, Takehiko,Kamimura, Hideo,Furukawa, Tsuyoshi
, p. 7560 - 7564 (1997)
Nitration of 5,13-di-tert-butyl-8,16-dimethoxy[2.2]MCP (metacyclophane = MCP) (1) with various nitrating reagents led to ipso-nitration at the tert-butyl group to give 5-tert-butyl-8,16-dimethoxy-13-nitro[2.2]MCP (2), as well as the corresponding 8,16-epo
A Mild Heteroatom (O -, N -, and S -) Methylation Protocol Using Trimethyl Phosphate (TMP)-Ca(OH) 2Combination
Tang, Yu,Yu, Biao
, (2022/03/27)
A mild heteroatom methylation protocol using trimethyl phosphate (TMP)-Ca(OH)2combination has been developed, which proceeds in DMF, or water, or under neat conditions, at 80 °C or at room temperature. A series of O-, N-, and S-nucleophiles, including phenols, sulfonamides, N-heterocycles, such as 9H-carbazole, indole derivatives, and 1,8-naphthalimide, and aryl/alkyl thiols, are suitable substrates for this protocol. The high efficiency, operational simplicity, scalability, cost-efficiency, and environmentally friendly nature of this protocol make it an attractive alternative to the conventional base-promoted heteroatom methylation procedures.
N-Heterocyclic Carbene-Catalyzed Truce-Smiles Rearrangement of N-Arylacrylamides via the Cleavage of Unactivated C(aryl)-N Bonds
Yasui, Kosuke,Kamitani, Miharu,Fujimoto, Hayato,Tobisu, Mamoru
supporting information, p. 1572 - 1576 (2021/03/03)
We report on the N-heterocyclic carbene (NHC)-catalyzed Truce-Smiles rearrangement of aniline derivatives, in which an unactivated C(aryl)-N bond is cleaved, leading to the formation of a new C(aryl)-C bond. The key to the success of this reaction is the
Pd-Catalyzed ipso, meta-Dimethylation of ortho-Substituted Iodoarenes via a Base-Controlled C-H Activation Cascade with Dimethyl Carbonate as the Methyl Source
Wu, Zhuo,Wei, Feng,Wan, Bin,Zhang, Yanghui
supporting information, p. 4524 - 4530 (2021/05/04)
A methyl group can have a profound impact on the pharmacological properties of organic molecules. Hence, developing methylation methods and methylating reagents is essential in medicinal chemistry. We report a palladium-catalyzed dimethylation reaction of ortho-substituted iodoarenes using dimethyl carbonate as a methyl source. In the presence of K2CO3 as a base, iodoarenes are dimethylated at the ipso- and meta-positions of the iodo group, which represents a novel strategy for meta-C-H methylation. With KOAc as the base, subsequent oxidative C(sp3)-H/C(sp3)-H coupling occurs; in this case, the overall transformation achieves triple C-H activation to form three new C-C bonds. These reactions allow expedient access to 2,6-dimethylated phenols, 2,3-dihydrobenzofurans, and indanes, which are ubiquitous structural motifs and essential synthetic intermediates of biologically and pharmacologically active compounds.
Synthesis of a poly-heterocyclic tetra-substituted alkene via a palladium-catalyzed four-fold domino reaction for the design of polymeric molecular switches
Khan, Taukeer A.,Tietze, Lutz F.
, p. 1183 - 1195 (2019/07/31)
A facile synthesis of a complex poly-heterocyclic tetrasubstituted alkene 4 with intrinsic helical chirality containing two acrylate moieties suitable for polymerization is described. Compound 4 can act as a molecular switch and was prepared via a palladi
Palladium-Catalyzed 4-Fold Domino Reaction for the Synthesis of a Polymeric Double Switch
Khan, Taukeer A.,Fornefeld, Torsten,Hübner, Dennis,Vana, Philipp,Tietze, Lutz F.
supporting information, p. 2007 - 2010 (2018/04/16)
A palladium-catalyzed 4-fold domino reaction consisting of two carbopalladation reactions and two C-H activation reactions, followed by the introduction of an acrylate moiety, led to the tetra-substituted helical alkene A2, using the dialkyne A3 as a subs
Semi-quantitative models for identifying potent and selective transthyretin amyloidogenesis inhibitors
Connelly, Stephen,Mortenson, David E.,Choi, Sungwook,Wilson, Ian A.,Powers, Evan T.,Kelly, Jeffery W.,Johnson, Steven M.
supporting information, p. 3441 - 3449 (2017/07/07)
Rate-limiting dissociation of the tetrameric protein transthyretin (TTR), followed by monomer misfolding and misassembly, appears to cause degenerative diseases in humans known as the transthyretin amyloidoses, based on human genetic, biochemical and pharmacologic evidence. Small molecules that bind to the generally unoccupied thyroxine binding pockets in the native TTR tetramer kinetically stabilize the tetramer, slowing subunit dissociation proportional to the extent that the molecules stabilize the native state over the dissociative transition state—thereby inhibiting amyloidogenesis. Herein, we use previously reported structure-activity relationship data to develop two semi-quantitative algorithms for identifying the structures of potent and selective transthyretin kinetic stabilizers/amyloidogenesis inhibitors. The viability of these prediction algorithms, in particular the more robust in silico docking model, is perhaps best validated by the clinical success of tafamidis, the first-in-class drug approved in Europe, Japan, South America, and elsewhere for treating transthyretin aggregation-associated familial amyloid polyneuropathy. Tafamidis is also being evaluated in a fully-enrolled placebo-controlled clinical trial for its efficacy against TTR cardiomyopathy. These prediction algorithms will be useful for identifying second generation TTR kinetic stabilizers, should these be needed to ameliorate the central nervous system or ophthalmologic pathology caused by TTR aggregation in organs not accessed by oral tafamidis administration.
A new tactic for tocopherol synthesis using intramolecular benzyne trapping by an alcohol
Knight, David W.,Xu, Qing
, p. 647 - 672 (2017/04/10)
A formal total synthesis of (S)-α-Tocopherol, the major component of natural Vitamin E has been achieved using intramolecular benzyne trapping as a key step to form the chroman ring. The synthesis also features an efficient new method for benzotriazole N-Amination using an oxaziridine; chiral, nonracemic intermediates are generated using asymmetric dihydroxylation.
Synthesis of a new mutagenic benzoazepinoquinolinone derivative
Ozeki, Minoru,Muroyama, Atsushi,Kajimoto, Tetsuya,Watanabe, Tetsushi,Wakabayashi, Keiji,Node, Manabu
scheme or table, p. 1781 - 1784 (2009/12/09)
A novel mutagenic compound 1, isolated as a Maillard product from tryptophan and glucose, was synthesized using Larock's quinoline formation, where addition of iodonium cation to an acetylene moiety of N-propargylaniline triggers subsequent intramolecular
A synthesis of α-tocopherol featuring benzyne trapping by an alcohol
Knight, David W.,Qing, Xu
scheme or table, p. 3534 - 3537 (2009/12/01)
A formal total synthesis of α-tocopherol, the main component of Vitamin E, has been achieved in which a central step is the intramolecular trapping of a highly substituted benzyne by an alcohol group to establish the pyran ring.
