undergo [2+2+2] cyclotrimerization with nitriles in the presence of a catalytic amount of the ruthenium complex Cp*RuCl(cod) (10 mol%) to afford the corresponding halopyridines under ambient conditions in good isolated yields (up to 90%). The halopyridines are formed as two separable regioisomers. This is the first example of a direct synthesis of halopyridines from haloalkynes and nitriles.
Toward Metal Complexes That Can Directionally Walk Along Tracks: Controlled Stepping of a Molecular Biped with a Palladium(II) Foot
作者:Jonathon E. Beves、Victor Blanco、Barry A. Blight、Romen Carrillo、Daniel M. D’Souza、David Howgego、David A. Leigh、Alexandra M. Z. Slawin、Mark D. Symes
DOI:10.1021/ja4123973
日期:2014.2.5
report on the design, synthesis, and operation of a bimetallic molecular biped on a three-foothold track. The "walker" features a palladium(II) complex "foot" that can be selectively stepped between 4-dimethylaminopyridine and pyridine ligand sites on the track via reversible protonation while the walker remains attached to the track throughout by means of a kinetically inert platinum(II) complex foot. The
我们报告了双金属分子双足动物在三足轨道上的设计、合成和操作。“助行器”具有钯 (II) 复合“脚”,可以通过可逆质子化选择性地在轨道上的 4-二甲氨基吡啶和吡啶配体位点之间移动,而助行器通过动力学惰性的铂始终保持附着在轨道上( II) 复足。三个配体结合位点的取代模式,连同金属-配体配位键的动力学稳定性,为两个位置异构体提供了高度的亚稳定性,这意味着改变轨道的化学状态不会自动引发步入没有额外的刺激(在配位溶剂存在下加热)。
Kobalt-katalysiert Cycloadditionen von Alkinen und Nitrilen zu Pyridinen: Ein neuer Zugang zu Pyridoxin (Vitamin B6)
作者:Rudolf E. Geiger、Michel Lalonde、Hansij�rg Stoller、Kuno Schleich
DOI:10.1002/hlca.19840670513
日期:1984.8.8
Cobalt-Catalyzed Cycloaddition of Alkynes and Nitriles to Pyridines: A New Route to Pyridoxine (Vitamin B6)
Optimization of Orally Bioavailable PI3Kδ Inhibitors and Identification of Vps34 as a Key Selectivity Target
作者:Zoë A. Henley、Augustin Amour、Nick Barton、Marcus Bantscheff、Giovanna Bergamini、Sophie M. Bertrand、Máire Convery、Kenneth Down、Birgit Dümpelfeld、Chris D. Edwards、Paola Grandi、Paul M. Gore、Steve Keeling、Stefano Livia、David Mallett、Aoife Maxwell、Mark Price、Christina Rau、Friedrich B. M. Reinhard、James Rowedder、Paul Rowland、Jonathan A. Taylor、Daniel A. Thomas、Edith M. Hessel、J. Nicole Hamblin
DOI:10.1021/acs.jmedchem.9b01585
日期:2020.1.23
Optimization of a lead series of PI3Kδ inhibitors based on a dihydroisobenzofuran core led to the identification of potent, orally bioavailable compound 19. Selectivity profiling of compound 19 showed similar potency for class III PI3K, Vps34, and PI3Kδ, and compound 19 was not well-tolerated in a 7-day rat toxicity study. Structure-based design led to an improvement in selectivity for PI3Kδ over Vps34
we wish to report the intramolecular [2 + 2 + 2] cocyclotrimerization of nitrilediynes catalyzed by the CoI2(dppe)/Zn system at 80 degrees C in CH3CN. Under these reaction conditions, various highly substituted nitrilediynes having steric conjunction at the alpha and beta positions to a nitrile group and a bulkier substitution at the terminal carbon of alkyne undergo [2 + 2 + 2] cocylotrimerization