Formation of Methyl Acrylate from CO2 and Ethylene via Methylation of Nickelalactones
摘要:
The nickel-induced coupling of ethylene and CO2 represents a promising pathway toward acrylates. To overcome the high bond dissociation energies of the M-O moieties, we worked out an in situ methylation of nickelalactones to realize the beta-hydirde elimination and the liberation of the acrylate species.
3-Carbonylamino-8-aminoisoquinoline compounds of formula (I):
variations thereof, and their use as inhibitors of HPK1 (hematopoietic kinase 1) are described. The compounds are useful in treating HPK1-dependent disorders and enhancing an immune response. Also described are methods of inhibiting HPK1, methods of treating HPK1-dependent disorders, methods for enhancing an immune response, and methods for preparing the 3-carbonylamino-8-aminoisoquinoline compounds.
An efficient short-step synthesis of α-substituted β-amino, β-hydrazino, β-N-hydroxy esters and β-urethane N-carboxyanhydrides is reported. Structural diversity was easily incorporated in good yields at the α position of the carboxylic group via conjugate radical additions and Heck reactions performed on the conjugated double bond of synthons 3, 8 and 9.
Preparation and Reactivities of (η<sup>3</sup>-1- and 2-Trimethylsiloxyallyl)Fe(CO)<sub>2</sub>NO Complexes. Intermediates Functioning as Equivalents of β- and α-Acyl Carbocations and Acyl Carbanions
作者:Keiji Itoh、Saburo Nakanishi、Yoshio Otsuji
DOI:10.1246/bcsj.64.2965
日期:1991.10
(η3-1- and 2-Trimethylsiloxyallyl)Fe(CO)2NO complexes were prepared by the reaction of the corresponding siloxyallylic halides with Bu4N[Fe(CO)3NO]. These complexes reacted with both of carbon nucleophiles and carbon electrophiles preferentially at the less hindered sites of the allylic ligands. In these reactions, (η3-1-trimethylsiloxyallyl)Fe(CO)2NO complexes served as synthetically equivalent synthons
Carbonylative coupling of organozinc reagents in the presence and absence of aryl iodides: synthesis of unsymmetrical and symmetrical ketones
作者:Richard F. W. Jackson、Debra Turner、Michael H. Block
DOI:10.1039/a606394b
日期:——
The utility of the palladium(0) catalysed reaction of the
iodoalanine-derived organozinc reagent 6a with functionalised
aryl iodides, under a carbon monoxide atmosphere, to give
protected 4-aryl-4-oxo α-amino acids 8, is illustrated by
a short synthesis of L-kynurenine 4. Treatment of
functionalised organozinc reagents with catalytic
tetrakis(triphenylphosphine)palladium(0) under an atmosphere of
carbon monoxide in the absence of any electrophile leads to the
formation of symmetrical functionalised ketones 9 in good yields.
This reaction is illustrated by a one-step synthesis of protected
(2S,6S)-4-oxo-2,6-diaminopimelic acid 9a from
commercially available compounds. It has been established that
adventitious molecular oxygen plays a key role in the formation
of the symmetrical ketones 9, and that rigorous exclusion of
oxygen can result in substantially higher yields of ketones 8 in
the cross-coupling with some aromatic iodides.
A mild and efficient method has been developed for the synthesis of alkyl and alkenyl iodides from alkenes and alkynes using polymethylhydrosiloxane (PMHS) and iodine in chloroform at room temperat...