66037-04-5Relevant articles and documents
Direct Acetoxylation of Arenes
Hong Nguyen, Thi Anh,Hou, Duen-Ren
supporting information, p. 8127 - 8131 (2021/08/23)
Acetoxylation of arenes is an important reaction and an unmet need in chemistry. We report a metal-free, direct acetoxylation reaction using sodium nitrate under an anhydrous environment of trifluoroacetic acid, acetic acid, and acetic anhydride. Arenes (31 examples), with oxidation potentials (Eox, in V vs SCE) lower than benzene (2.48 V), were acetoxylated with good yields and regioselectivity. A stepwise, single electron-transfer mechanism is proposed.
Synthesis of a TNF inhibitor, flurbiprofen and an: I -Pr analogue in enantioenriched forms by copper-catalyzed propargylic substitution with Grignard reagents
Isogawa, Yukari,Kobayashi, Yuichi,Ogawa, Narihito,Takashima, Yuji,Tsuboi, Atsuki
supporting information, p. 9906 - 9909 (2021/12/07)
The copper-catalyzed substitution reaction of diethyl phosphate derived from TMSCCCH(OH)CH2CH2OTBDPS with 3-c-C5H9-4-MeOC6H3MgBr, followed by several transformations, afforded a tumor necrosis factor inhibitor possessing a Ph-acetylene moiety. The inhibitor was also synthesized from phenylacetylene phosphate PhCCCH(OP(O)(OEt)2)CH2CH2OTBDPS. Furthermore, the substitution of phosphates derived from TMSCCCH(OH)CH3 and TMSCCCH(OH)-i-Pr with 3-F-4-PhC6H3MgBr gave the corresponding substitution products, which were transformed to flurbiprofen and its i-Pr analogue, respectively. The copper-catalyzed substitutions in these syntheses proceeded in a regio- and stereoselective manner. This journal is
Methods for preparation of apremilast
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Page/Page column 20-21, (2021/05/19)
The present invention discloses a method for preparation of Apremilast. β-phthalimino vinylsulfones are reacted through the asymmetric addition reaction to form an addition product, and the drug of Apremilast can be obtained from the addition product through simple reactions. The method is a process for synthesizing Apremilast in a more efficient way.
Asymmetric Synthesis of β-Aryl β-Imido Sulfones Using Rhodium Catalysts with Chiral Diene Ligands: Synthesis of Apremilast
Syu, Jin-Fong,Gopula, Balraj,Jian, Jia-Hong,Li, Wei-Sian,Kuo, Ting-Shen,Wu, Ping-Yu,Henschke, Julian P.,Hsieh, Meng-Chi,Tsai, Ming-Kang,Wu, Hsyueh-Liang
supporting information, p. 4614 - 4618 (2019/06/27)
A chiral rhodium(I)-diene catalyst enabled the one-step synthesis of β-aryl β-imido sulfones under mild reaction conditions. By selection of the chiral diene ligand L1a or L2, each enantiomer of the chiral β-aryl β-imido sulfone target can be accessed with high stereoselectivity. Demonstration of the scope of the reaction, which includes the synthesis of an N-protected chiral β-amino β-phenyl sulfone, culminated with the efficient synthesis of the heteroatom-rich active pharmaceutical ingredient apremilast.
Synthesis and anti-inflammatory activity of isoquebecol
Cardinal, Sébastien,Paquet-C?té, Pierre-Alexandre,Azelmat, Jabrane,Bouchard, Corinne,Grenier, Daniel,Voyer, Normand
, p. 2043 - 2056 (2017/03/23)
We report here the synthesis of isoquebecol, an unprecedented constitutional isomer of quebecol, a polyphenolic compound discovered in maple syrup. The methodology used to prepare isoquebecol involves, as key steps, the formation of a dibromoalkene from an α-ketoester precursor, followed by a double Suzuki-Miyaura reaction. The anti-inflammatory activity of isoquebecol was studied on macrophage cells by monitoring its ability to inhibit LPS-induced IL-6 secretion. Results show that this new compound has an improved bioactivity over that of its natural isomer. Precursors and derivatives of quebecol, isoquebecol and model analog 2,3,3-triphenylpropanol were also prepared and tested in this study. Comparison between the three series of compounds led to establishing new SARs concerning the aryl ring substitution pattern on the triarylpropanol scaffold and substructure functionalization.
Synthesis of 1-[3-(Cyclopentyloxy)-4-methoxyphenyl]cyclopentanol as potential phosphodiesterase-4 inhibitor
Yahya-Meymandi,Mohammadi Ziarani,Shafiee,Foroumadi
experimental part, p. 4008 - 4010 (2012/01/13)
The enzyme phosphodiesterase-4 (PDE4) plays a key role in many physiological or pathological processes in mammalian organs, where its inhibition increases cyclic adenosine monophosphate (cAMP) causing benefits in many diseases or conditions. The aim of this study is to synthesize 1-(3-(cyclopentyloxy)-4-methoxyphenyl)cyclopentanol (6) as potential phosphodiesterase-4 inhibitor. Starting from 2- methoxy phenol (1), 4-bromo-2-(cyclopentyloxy)-1-methoxybenzene (5) was synthesized in good yields. 1-[3-(Cyclopentyloxy)-4- methoxyphenyl]cyclopentanol (6) was prepared from 5 using two different methods.
Co-catalyzed reductive cyclization of azido and cyano substituted α,β-unsaturated esters with NaBH4: enantioselective synthesis of (R)-baclofen and (R)-rolipram
Paraskar, Abhimanyu S.,Sudalai, Arumugam
, p. 4907 - 4916 (2007/10/03)
Sodium borohydride in combination with a catalytic amount of CoCl2 has been found to be an excellent catalytic system in reductive cyclizations of suitably substituted azido and cyano groups of α,β-unsaturated esters to afford γ and δ-lactams in high yields. The process has been demonstrated for the enantioselective synthesis of (R)-baclofen, (R)-rolipram, and (R)-4-fluorophenylpiperidinone, a key intermediate for (-)-paroxetine.
The Bromination of Phenolic Methyl Ethers with Hydrogen Bromide using Sodium Tungstate and Hydrogen Peroxide as Oxidant
Bezodis, Paul,Hanson, James R.,Petit, Philippe
, p. 334 - 335 (2007/10/03)
Sodium tungstate has been found to be an effective catalyst for the nuclear bromination of some aromatic methyl ethers using hydrogen bromide in glacial acetic acid and hydrogen peroxide as the oxidant.