Enhanced Rate and Selectivity by Carboxylate Salt as a Basic Cocatalyst in Chiral N-Heterocyclic Carbene-Catalyzed Asymmetric Acylation of Secondary Alcohols
摘要:
The rate and enantioselectivity of chiral NHC-catalyzed asymmetric acylation of alcohols with an adjacent H-bond donor functionality are remarkably enhanced in the presence of a carboxylate cocatalyst. The degree of the enhancement is correlated with the basicity of the carboxylate. With a cocatalyst and a newly developed electron-deficient chiral NHC, kinetic resolution and desymmetrization of cyclic diols and amino alcohols were achieved with extremely high selectivity (up to s = 218 and 99% ee, respectively) at a low catalyst loading (0.5 mol %). This asymmetric acylation is characterized by a unique preference for alcohols over amines, which are not converted into amides under the reaction conditions.
CIS 3,4-DIHYDROXY-2-(3-METHYLBUTANOYL)-5-(3-METHYLBUTYL)-4-(4-METHYLPENTANOYL)CYCLOPENT-2-EN-1-ONE DERIVATIVES, SUBSTANTIALLY ENANTIOMERICALLY PURE COMPOSITIONS AND METHODS
Direct N–O bond formation <i>via</i> oxidation of amines with benzoyl peroxide
作者:Amit Banerjee、Hisashi Yamamoto
DOI:10.1039/c8sc04996c
日期:——
(amide) formation starting from commercially available amines and benzoylperoxide. The oxidation of 1,2-diamines to furnish bis-(benzoyloxy)-1,2-diamines is reported for the first time. We found that a significant amount of water (BPO : water = 3 : 1) in combination with Cs2CO3 is necessary to achieve high selectivity and yield. The reaction conditions are applicable to a wide range of 1,2-diamine
Hydrophosphonylation of chiral hexahydroquinoxalin-2(1H)-one derivatives as an effective route to new bicyclic compounds: Aminophosphonates, enamines and imines
作者:Jakub Iwanejko、Anna Brol、Bartłomiej Szyja、Marek Daszkiewicz、Elżbieta Wojaczyńska、Tomasz K. Olszewski
DOI:10.1016/j.tet.2019.01.062
日期:2019.3
A series of new aminophosphonate and phosphonic acid derivatives of hexahydroquinoxalin-2(1H)-ones and tetrahydroquinoxalin-2(1H)-ones were synthesised via hydrophosphonylation of the corresponding bicyclic imines with various dialkyl or diaryl H-phosphonates, H-phosphinates or H-phosphine oxides as phosphorus nucleophiles. The utility of the obtained compounds was demonstrated by their application
一系列新氨基膦和hexahydroquinoxalin-2的膦酸衍生物的(1 ħ) -酮和四氢喹啉-2(1 H ^) -酮进行经由与各种二烷基相应的二环亚胺或二芳基的hydrophosphonylation合成ħ -phosphonates,ħ -phosphinates或H-氧化膦作为磷亲核试剂。通过将它们用作霍纳-沃兹沃思-埃蒙斯(HWE)反应中膦酸碳负离子的来源,证明了所获得化合物的效用,这导致新的双环胺具有环外和意外的环内双键,这取决于环的结构。使用的醛。
A minimal structural variation can overcome tumour resistance of oxaliplatin: the case of 4,5-dehydrogenation of the cyclohexane ring
作者:Paride Papadia、Valentina Gandin、Alessandra Barbanente、Alessandro G. Ruello、Cristina Marzano、Katia Micoli、James D. Hoeschele、Giovanni Natile、Nicola Margiotta
DOI:10.1039/c9ra07760j
日期:——
A new family of anticancer compounds has been derived from oxaliplatin by inserting a double-bond between carbons 4 and 5 of the 1,2-diaminocyclohexane ring.
CIS, 3,4-DIHYDROXY-2-(3-METHYLBUTANOYL)-5-(3-METHYLBUTYL)-4-(4-METHYLPENTANOYL)CYCLOPENT-2-EN-1-ONE DERIVATIVES, SUBSTANTIALLY ENANTIOMERICALLY PURE COMPOSITIONS AND METHODS
申请人:CARROLL Brian J.
公开号:US20130018105A1
公开(公告)日:2013-01-17
The present application provides cis 3,4-dihydroxy-2-(3-methylbutanoyl)-5-(3-methylbutyl)-4-(4-methylpentanoyl)cyclopent-2-en-1-one derivatives and substantially enantiomerically pure compositions thereof. These derivatives include (+)-(4S,5R)—3,4-dihydroxy-2-(3-methylbutanoyl)-5-(3-methylbutyl)-4-(4-methylpentanoyl)cyclopent-2-en-1-one, (−)-(4R,5S)-3,4-dihydroxy-2-(3-methylbutanoyl)-5-(3-methylbutyl)-4-(4-methylpentanoyl)cyclopent-2-en-1-one, and salts and crystals thereof. The application further provides methods of using the disclosed compounds and compositions to activate PPARγ, activate GPR120, inhibit inflammation, and treat conditions responsive to PPARγ modulation, conditions responsive to GPR120 modulation, and metabolic disturbances such as diabetes.
[EN] CIS 3,4-DIHYDROXY-2-(3-METHYLBUTANOYL)-5-(-3-METHYLBUTYL)-4-(4-METHYLPENTANOYL)CYCLOPENT-2-EN-1-ONE DERIVATIVES, SUBSTANTIALLY ENANTIOMERICALLY PURE COMPOSITIONS AND METHODS<br/>[FR] DÉRIVÉS DE CIS 3,4-DIHYDROXY-2-(3-MÉTHYLBUTANOYL)-5-(3-MÉTHYLBUTYL)-4-(4-MÉTHYLPENTANOYL)CYCLOPENT-2-ÈN-1-ONE, COMPOSITIONS SENSIBLEMENT ÉNANTIOMÉRIQUEMENT PURES ET PROCÉDÉS
申请人:KINDEX THERAPEUTICS LLC
公开号:WO2012058649A1
公开(公告)日:2012-05-03
The present application provides cis 3,4-dihydroxy-2-(3-methylbutanoyl)-5-(3- methylbutyl)-4-(4-methylpentanoyl)cyclopent-2-en-1-one derivatives and substantially enantiomerically pure compositions thereof. These derivatives include (+)-(4S,5R)- 3,4- dihydroxy-2-(3-methylbutanoyl)-5-(3-methylbutyl)-4-(4-methylpentanoyl)cyclopent-2-en-1-one, (-)-(4R,5S)-3,4-dihydroxy-2-(3-methylbutanoyl)-5-(3-methylbutyl)-4-(4- methylpentanoyl)cyclopent-2-en-1-one, and salts and crystals thereof. The application further provides methods of using the disclosed compounds and compositions to activate PPARƳ, activate GPR120, inhibit inflammation, and treat conditions responsive to PPARƳ modulation, conditions responsive to GPR120 modulation, and metabolic disturbances such as diabetes.