Rh-Catalyzed Highly Enantioselective Hydroalkynylation Reaction of Norbornadiene Derivatives
作者:Baomin Fan、Jianbin Xu、Qingjing Yang、Sifeng Li、Hualei Chen、Shanshan Liu、Lu Yu、Yongyun Zhou、Lin Wang
DOI:10.1021/ol402804t
日期:2013.12.6
The complexes of various Rh precusors with ferrocenyl chiral ligand (R,S)-Cy2PF-PPh2 were found effective catalysts for the asymmetrichydroalkynylation reaction of norbornadiene derivatives. When RhCl3·3H2O was employed, good yields (up to 98%) and high enantioselectivities (up to >99.9% ee) could be obtained for the reactions of a broad scope of substrates.
Cyclobutano[a]indene: a highly reactive strained olefin which plays a key trapping role in the photodecomposition of a polycyclic α-dione
作者:Ronald N. Warrener、Peter A. Harrison、Meta Sterns、Richard A. Russell
DOI:10.1039/c39840000546
日期:——
Cyclobutano[a]indene is characterised for the first time and shown to undergo a selection of cycloaddition reactions, including self-dimerisation to a [π2 +π2] dimmer whose structure has been confirmed by single crystal X-ray analysis.
环丁烷[ a ]茚是首次表征,并显示出经历了一系列环加成反应,包括自二聚化为[π2+π2]二聚体,其结构已通过单晶X射线分析得到了证实。
In-Line Proximity Effects in Extended 7-Azanorbornanes. 1. A New Concept for Modifying Effector Group Separation Based on the Control of <i>N</i>-Invertomer Geometry
作者:Douglas N. Butler、Malcom L. A. Hammond、Martin R. Johnston、Guangxing Sun、John R. Malpass、John Fawcett、Ronald N. Warrener
DOI:10.1021/ol9910969
日期:2000.3.1
Control of N-substituent geometry in fused 7-azanorbornane systems is based on the dominance of one proximate bridge (sentinel X) over the other (sentinel Y) relative to the N-bridge; the N-inversion equilibrium can effectively be displaced in favor of a single invertomer. This study has used a combination of synthesis, crystallography, and molecular modeling to establish stereostructures.
π-Bond Screening in Benzonorbornadienes: The Role of 7-Substituents in Governing the Facial Selectivity for the Diels-Alder Reaction of Benzonorbornadienes with 3,6-Di(2-pyridyl)-s-Tetrazine
作者:Ronald Warrener、Peter Harrison
DOI:10.3390/60400353
日期:——
π-bond changes from exo-attack for 21 and 23 to endo-attack for 25 and 27. The 7-spirocyclopropyl benzonorbornadiene 23 typically forms a mixture of dihydropyridazines with exo-stereo- chemistry, which undergo further stereochemical isomerisation to an exo-fused product upon acetylation (acetyl chloride in hot pyridine). Oxidation with DDQ of the dihydropyridazines individually or as mixtures gives the
Nickel-Catalyzed Three-Component Coupling between Aryl Aldehydes, Norbornenes, and Silanes Leading to Indanols through Aromatic CH Bond Activation of Aryl Aldehydes
The first example of the title reaction involving the combination of an aryl aldehyde, norbornene, and silane has been developed (see scheme). The reaction involves aromatic CH bondactivation of an aryl aldehyde at the ortho position, it proceeded with good diastereoselectively, and is applicable for various aryl aldehydes and norbornenes or norbornadienes. cod=cycloocta‐l,5‐diene, THF=tetrahydrofuran