iminyl‐radical formation has been established for the construction of pyridines, quinolines, and phenanthridines from acyl oximes. With fac‐[Ir(ppy)3] as a photoredox catalyst, the acyl oximes were converted by 1 e− reduction into iminyl radical intermediates, which then underwent intramolecular homolytic aromatic substitution (HAS) to give the N‐containing arenes. These reactions proceeded with a broad
已经建立了涉及可见光诱导的亚胺基自由基形成的统一策略,用于从酰基肟中构建吡啶,喹啉和菲啶。用FAC - [的Ir(ppy)3 ]作为催化剂photoredox,酰基肟通过1e中转化-还原成亚氨基自由基中间体,然后行分子内均裂芳族取代(HAS),得到含有N-芳烃其中。这些反应在室温下以宽范围的底物以高收率进行。这种可见光诱导的亚胺基自由基形成策略已成功地应用于五步精简合成苯并[ c ]菲啶生物碱。
The Long-Arm Effect: Influence of Axially Chiral Phosphoramidite Ligands on the Diastereo- and Enantioselectivity of the Tandem 1,4-Addition/Fluorination
作者:Lian Wang、Wei Meng、Chuan-Le Zhu、Yan Zheng、Jing Nie、Jun-An Ma
DOI:10.1002/anie.201104565
日期:2011.9.26
Long arm of the law: The long‐armed phosphoramidite 1 was used as a catalyst for the title reaction of acyclic alkylidene β‐ketoesters with dialkylzinc and fluorinating reagents. The products, containing adjacent carbon‐ and fluorine‐substituted stereocenters, are obtained in high yield as well as diastereo‐ and enantioselectivity. NSFI=N‐fluorobenzenesulfonimide.
intermediary amino compounds are isolated. The reaction involves many reversible steps, and the stereochemistry of products is determined in the elimination step from the intermediary compounds via stable planar carbanions, in which the small difference in the stericrequirements of two electron-withdrawing groups is effective. Steric and electronic effects in the intermediates sometimes bring about the
for the conversion of α,β-unsaturated carbonyls to multi-substituted benzenes using allylicphosphoniumylide reagents has been developed. The substituents and their positions on the benzene ring are controllable and predictable by the choice of an appropriate combination of α,β-unsaturated carbonyl compounds and ylides.
The first successful intermolecular Heck reaction of Baylis–Hillman adducts: synthesis of β-aryl substituted Baylis–Hillman adducts
作者:Jeong Mi Kim、Ko Hoon Kim、Taek Hyeon Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2008.03.102
日期:2008.5
The first successful intermolecular Heck reaction between Baylis–Hillmanadducts and aryl iodides was achieved under the conditions comprising Pd(OAc)2/n-Bu4NBr/KOAc in CH3CN.
在包括CH 3 CN中的Pd(OAc)2 / n -Bu 4 NBr / KOAc的条件下,成功实现了Baylis-Hillman加合物和碘代芳基化合物之间的第一个成功的分子间Heck反应。