29667-46-7Relevant articles and documents
Donor-Acceptor Bicyclopropyls as 1,6-Zwitterionic Intermediates: Synthesis and Reactions with 4-Phenyl-1,2,4-triazoline-3,5-dione and Terminal Acetylenes
Potapov, Konstantin V.,Denisov, Dmitry A.,Glushkova, Valeriia V.,Novikov, Roman A.,Tomilov, Yury V.
, p. 15562 - 15576 (2020/11/30)
The bicyclopropyl system activated by incorporation of donor and acceptor groups in the presence of Lewis acids was used as a synthetic equivalent of 1,6-zwitterions. Opening of both cyclopropane rings in 2′-aryl-1,1′-bicyclopropyl-2,2-dicarboxylates (D-A bicyclopropyl, ABCDs) in the presence of GaI3 + Bu4N+GaI4- results in 5-iodo-5-arylpent-2-enylmalonates as products of HI formal 1,6-addition to the bicyclopropyl system. The use of GaCl3 or GaBr3 as a Lewis acid and terminal aryl or alkyl acetylenes as 1,6-zwitterion interceptors allows the alkyl substituent to be grown to give the corresponding acyclic 7-chloro(bromo)-hepta-2,6-dienylmalonates. The reaction of ABCDs with 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD) catalyzed by Yb(OTf)3 also results in the opening of both cyclopropane rings. The reaction products are tetrahydropyridazine derivatives - (7,9-dioxo-1,6,8-triazabicyclo[4.3.0]non-3-en-2-ylmethyl)malonates - containing one more PTAD moiety in the malonyl group.
5,6,7,8-Tetrahydro-1,6-naphthyridine Derivatives as Potent HIV-1-Integrase-Allosteric-Site Inhibitors
Peese, Kevin M.,Allard, Christopher W.,Connolly, Timothy,Johnson, Barry L.,Li, Chen,Patel, Manoj,Sorensen, Margaret E.,Walker, Michael A.,Meanwell, Nicholas A.,McAuliffe, Brian,Minassian, Beatrice,Krystal, Mark,Parker, Dawn D.,Lewis, Hal A.,Kish, Kevin,Zhang, Ping,Nolte, Robert T.,Simmermacher, Jean,Jenkins, Susan,Cianci, Christopher,Naidu, B. Narasimhulu
, p. 1348 - 1361 (2019/02/24)
A series of 5,6,7,8-tetrahydro-1,6-naphthyridine derivatives targeting the allosteric lens-epithelium-derived-growth-factor-p75 (LEDGF/p75)-binding site on HIV-1 integrase, an attractive target for antiviral chemotherapy, was prepared and screened for activity against HIV-1 infection in cell culture. Small molecules that bind within the LEDGF/p75-binding site promote aberrant multimerization of the integrase enzyme and are of significant interest as HIV-1-replication inhibitors. Structure-activity-relationship studies and rat pharmacokinetic studies of lead compounds are presented.
Asymmetric Reductive Carbocyclization Using Engineered Ene Reductases
Heckenbichler, Kathrin,Schweiger, Anna,Brandner, Lea Alexandra,Binter, Alexandra,Toplak, Marina,Macheroux, Peter,Gruber, Karl,Breinbauer, Rolf
supporting information, p. 7240 - 7244 (2018/06/15)
Ene reductases from the Old Yellow Enzyme (OYE) family reduce the C=C double bond in α,β-unsaturated compounds bearing an electron-withdrawing group, for example, a carbonyl group. This asymmetric reduction has been exploited for biocatalysis. Going beyond its canonical function, we show that members of this enzyme family can also catalyze the formation of C?C bonds. α,β-Unsaturated aldehydes and ketones containing an additional electrophilic group undergo reductive cyclization. Mechanistically, the two-electron-reduced enzyme cofactor FMN delivers a hydride to generate an enolate intermediate, which reacts with the internal electrophile. Single-site replacement of a crucial Tyr residue with a non-protic Phe or Trp favored the cyclization over the natural reduction reaction. The new transformation enabled the enantioselective synthesis of chiral cyclopropanes in up to >99 % ee.
Lewis Acid Catalyzed Annulation of Cyclopropane Carbaldehydes and Aryl Hydrazines: Construction of Tetrahydropyridazines and Application Toward a One-Pot Synthesis of Hexahydropyrrolo[1,2- b]pyridazines
Dey, Raghunath,Kumar, Pankaj,Banerjee, Prabal
, p. 5438 - 5449 (2018/05/28)
In this report, a facile synthesis of tetrahydropyridazines via a Lewis acid catalyzed annulation reaction of cyclopropane carbaldehydes and aryl hydrazines has been demonstrated. Moreover, the generated tetrahydropyridazine further participated in a cycloaddition reaction with donor-acceptor cyclopropanes to furnish hexahydropyrrolo[1,2-b]pyridazines. We also performed these two steps in one pot in a consecutive manner. In addition, a monodecarboxylation reaction of hexahydropyrrolo[1,2-b]pyridazine was achieved with a good yield.
Highly efficient asymmetric simmons-smith cyclopropanation promoted by chiral heteroorganic aziridinyl ligands
Rachwalski, Michal,Kaczmarczyk, Sylwia,Lesniak, Stanislaw,Kielbasinski, Piotr
, p. 873 - 875 (2014/03/21)
Enantiomerically pure heteroorganic catalysts, bearing a hydroxy moiety, a stereogenic sulfinyl group, and a chiral aziridine moiety, have proved highly efficient in the asymmetric Simmons-Smith cyclopropanation of allylic alcohols, which generates the desired products in high yields (up to 95 %) and with ee values up to 94 %. The effect of the stereogenic centers at the sulfinyl sulfur atom and in the aziridine moiety on the stereochemical course of the title reaction is discussed. Combination at its best: Enantiomerically pure heteroorganic ligands, bearing a hydroxy moiety, a stereogenic sulfinyl group, and an enantiomeric aziridine moiety, have proved highly efficient in the asymmetric Simmons-Smith cyclopropanation of allylic alcohols, which generates the desired products in high yields (up to 95 %) and with ee values up to 94 %.
Improved zinc-catalyzed simmons-smith reaction: Access to various 1,2,3-trisubstituted cyclopropanes
Levesque, Eric,Goudreau, Sebastien R.,Charette, Andre B.
supporting information, p. 1490 - 1493 (2014/04/03)
The Simmons-Smith reaction of zinc carbenoids with alkenes is a powerful method to access cyclopropanes containing various substitution patterns. This work exploits the high reactivity of aryldiazomethanes toward zinc halides to generate aryl-substituted carbenoids catalytically. These carbenoids are able to cyclopropanate various alkenes diastereoselectively, including unfunctionalized substrates such as styrenes. The zinc catalyst can be modified to tolerate the use of free allylic alcohols.
Copper-catalyzed regio- and stereoselective intermolecular three-component oxyarylation of allenes
Itoh, Taisuke,Shimizu, Yohei,Kanai, Motomu
supporting information, p. 2736 - 2739 (2014/06/09)
A copper(II)-catalyzed intermolecular three-component oxyarylation of allenes using arylboronic acids as a carbon source and TEMPO as an oxygen source is described. The reaction proceeded under mild conditions with high regio- and stereoselectivity and functional group tolerance. A plausible reaction mechanism is proposed, involving carbocupration of allenes, homolysis of the intervening allylcopper(II), and a radical TEMPO trap.
CYCLOPROPANE DERIVATIVE HAVING BACE1 INHIBITING ACTIVITY
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Paragraph 0187; 0190, (2014/02/15)
The present invention relates to compounds of the Formula (I) and (II): wherein each variable is as defined in the specification, pharmaceutically acceptable salts and solvates thereof, as well as use of such compounds as a BACE1 inhibitor. The compounds of the invention are useful as an agent for treating a disease induced by production, secretion and/or deposition of amyloid β protein.
Conformational restriction approach to β-Secretase (BACE1) inhibitors: Effect of a cyclopropane ring to induce an alternative binding mode
Yonezawa, Shuji,Higashino, Kenichi,Tanaka, Yoshikazu,Nakano, Toru,Yamamoto, Takahiko,Yamakawa, Hidekuni,Muto, Chie,Hosono, Motoko,Hattori, Kazunari,Yutsudo, Takashi,Sakagami, Masahiro,Takemoto, Hiroshi,Iwamoto, Hideo,Kondo, Yutaka,Togame, Hiroko,Arisawa, Mitsuhiro,Shuto, Satoshi
, p. 8838 - 8858,21 (2020/09/16)
Improvement of a drugs binding activity using the conformational restriction approach with sp3 hybridized carbon is becoming a key strategy in drug discovery. We applied this approach to BACE1 inhibitors and designed four stereoisomeric cyclopropane compounds in which the ethylene linker of a known amidine-type inhibitor 2 was replaced with chiral cyclopropane rings. The synthesis and biologic evaluation of these compounds revealed that the cis-(1S,2R) isomer 6 exhibited the most potent BACE1 inhibitory activity among them. X-ray structure analysis of the complex of 6 and BACE1 revealed that its unique binding mode is due to the apparent CH-π interaction between the rigid cyclopropane ring and the Tyr71 side chain. A derivatization study using 6 as a lead molecule led to the development of highly potent inhibitors in which the structure-activity relationship as well as the binding mode of the compounds clearly differ from those of known amidine-type inhibitors.
Synthesis of highly functionalized cyclohexenone rings: Rhodium-catalyzed 1,3-acyloxy migration and subsequent [5+1] cycloaddition
Shu, Dongxu,Li, Xiaoxun,Zhang, Min,Robichaux, Patrick J.,Tang, Weiping
supporting information; scheme or table, p. 1346 - 1349 (2011/04/22)
Lead Rh-ole: Highly substituted cyclohexenones were prepared from cyclopropyl-substituted propargyl esters by using a [{Rh(CO)2Cl} 2] catalyst. This metal catalyst promoted the 1,3-acyloxy migration of propargyl esters and a subsequent [5+1] cycloaddition of the resulting allenylcyclopropanes in the presence of CO with high regioselectivity.
