Structure−Activity Relationships of a Series of Pyrrolo[3,2-<i>d</i>]pyrimidine Derivatives and Related Compounds as Neuropeptide Y5 Receptor Antagonists
作者:Mark H. Norman、Ning Chen、Zhidong Chen、Christopher Fotsch、Clarence Hale、Nianhe Han、Ray Hurt、Tracy Jenkins、John Kincaid、Longbin Liu、Yuelie Lu、Ofir Moreno、Vincent J. Santora、Jennifer D. Sonnenberg、William Karbon
DOI:10.1021/jm000269t
日期:2000.11.1
a series of pyrrolo[3, 2-d]pyrimidine derivatives was prepared and evaluated for their ability to bind to Y5 receptors in vitro. We report here the synthesis and initial structure-activity relationship investigations for this class of compounds. The target compounds were prepared by a variety of synthetic routes designed to modify both the substitution and the heterocyclic core of the pyrrolo[3,2-d]pyrimidine
Asymmetric Hydrogenation of Unfunctionalized Enamines Catalyzed by Iridium Complexes of Chiral Spiro N,N-Diarylphosphoramidites
作者:Pucha Yan、Jianhua Xie、Qilin Zhou
DOI:10.1002/cjoc.201090293
日期:2010.9
Chiral spiro N,N‐diarylphosphoramidites were synthesized. These new chiral spiro monophosphoramidites were efficient ligands for iridium‐catalyzedasymmetrichydrogenation of unfunctionalized enamines derived from simple alkyl aryl ketones, providing chiral tertiary amines in good enantioselectivities (up to 90% ee).
A process for the preparation of carboxylic acids represented by a formula ##STR1## wherein R.sub.1 represents hydrogen atom or a lower alkyl radical, R.sub.2 represents hydrogen atom, lower alkyl or allyl radical and R.sub.3 represents phenyl, substituted phenyl, substituted naphthyl, dibenzofuranyl or substituted biphenyl. Following novel enamine and amidine compounds as intermediates for manufacturing the carboxylic acids and processes for the manufacture of said enamine and amidine compounds ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 represent the meanings as referred to and R.sub.4 represents dimethylamino, pyrrolidyl, piperidyl or morpholyl.
Substituted pyridines from isoxazoles: scope and mechanism
作者:Seokjoo Lee、Rashmi Jena、Aaron L. Odom
DOI:10.1039/d2ob00779g
日期:——
Treatment of isoxazoles with enamines leads to an inverse electron-demand hetero-Diels–Alder reaction that produces substitutedpyridines in the presence of TiCl4(THF)2 and titanium powder. The reaction is highly regioselective with only a single isomer of the product observed by GC/MS and tolerant of many common functional groups. The transformation was examined computationally, and it was found that
Electrophilic Hydrosilylation of Electron‐Rich Alkenes Derived from Enamines
作者:Carlos Laglera-Gándara、Julián Jiménez-Pérez、Francisco José Fernández-de-Córdova、Pablo Ríos、Salvador Conejero
DOI:10.1002/anie.202404859
日期:——
14-Electron Pt(II) germyl complexes bearing small N-heterocyclic carbene ligands (NHC) catalyze the regio- and diastereoselective hydrosilylation (anti SiH bond addition) of electron-rich alkenes derived fromenamines, thus producing β-aminosilanes. On the contrary, using bulkier NHC ligands promotes the competitive silylative dehydrocoupling process. Mechanistic studies point to unprecedented outer-sphere Pt-catalyzed