Relay Catalysis To Synthesize β-Substituted Enones: Organocatalytic Substitution of Vinylogous Esters and Amides with Organoboronates
作者:Sasha Sundstrom、Thien S. Nguyen、Jeremy A. May
DOI:10.1021/acs.orglett.9b04584
日期:2020.2.21
Organocatalysis was shown to facilitate conjugate additions to vinylogousesters and amides for the first time. Subsequent elimination of a β-alcohol or amine provided π-conjugated β-substituted enones. Remarkably, nucleophile addition to the electron-rich vinylogous substrates is more rapid than classical enones, forming monosubstituted products. A doubly organocatalytic (organic diol and methyl aniline)
A Method for the Preparation of β-Amino-α,β-unsaturated Carbonyl Compounds: Study of Solvent Effect and Mechanism
作者:Reyno R. S.、Akash Sugunan、Ranganayakulu S.、Cherumuttathu H. Suresh、Goreti Rajendar
DOI:10.1021/acs.orglett.9b04531
日期:2020.2.7
An efficient method for the preparation of β-amino-α,β-unsaturated carbonylcompounds is demonstrated. Bench-stable sodium 3-oxo-enolates were prepared from carbonylcompounds, and reacted with amines in the presence of an acid and a desiccant. DFT studies revealed contrasting mechanisms toward the reactivity of aliphatic amines in protic solvents and aromatic amines in aprotic solvents. While the
Synthesis and Reactions of Haloazodienes. A New and General Synthesis of Substituted Pyridazines
作者:Michael S. South、Terri L. Jakuboski、Mark D. Westmeyer、Daniel R. Dukesherer
DOI:10.1021/jo960029e
日期:1996.1.1
tetrahydropyridazines that are formed give high yields of substituted pyridazines upon treatment with base (Table 1). The sequence of a chloroazodiene cyclization to a tetrahydropyridazine followed by an aromatization constitutes a new and generalsynthesis of substituted pyridazines. In contrast to the haloazodiene cyclizations, the novel cyclization reactions of the in-situ generated 1-carbethoxy-3-phenyl-4
[EN] NEW COMPOUNDS HAVING A SELECTIVE PDE4D INHIBITING ACTIVITY<br/>[FR] NOUVEAUX COMPOSÉS PRÉSENTANT UNE ACTIVITÉ D'INHIBITION SÉLECTIVE VIS-À-VIS DE PDE4D
申请人:UNIVERSIT DEGLI STUDI DI GENOVA
公开号:WO2015121212A1
公开(公告)日:2015-08-20
Compounds of formula (I), wherein Z = cyclopentyl. cyclopropylmethyl, -CH3; R' = -CH3, CHF2, X= formula (II) (III) (IV) (V) Y = - CO; -C=O(CH2), -CH(OH)-CH2, -CH2-C=O, -CH2-CH2-C=O; -CH2-CH(OH)-CH2, -CH2- CH(OCOR1)-CH2 NR2 = -N(CH2-CH2OH)2, formula (VI) (VII) (VIII) (IX) (X) (XI) R1 = optionally substituted C1-C8 alkyl, optionally substituted aryl; optionally substituted aralkyl, preferably C1-C3 alkyl, more preferably CH3; and enantiomers, diastereoisomers and pharmaceutically acceptable salts thereof; these compounds have a PDE4D inhibiting activity and can be used as a medicament for treating dementia, in particular Alzheimer disease, and for improving memory.
Methyl β-(Benzotriazol-l-yl) vinyl Ketone: A New p-Acetylvinyl Cation Equivalent
作者:Alan R. Katritzky、Torsten Blitzke、Jianqing Li
DOI:10.1080/00397919608003793
日期:1996.10
Abstract A simple and efficient two-step approach to methyl β-(benzotriazol-1-yl)vinyl ketone 7 is described. The synthetic utility of compound 7 has been demonstrated by nucleophilic substitutions of the benzotriazolyl group with a range of nucleophiles. Thus, methyl β-(benzotriazol-1-yl)vinyl ketone provides a new β-acetylvinyl cation equivalent.