E-mail: shjung@sungshin.ac.krReceived March 17, 2014 Accepted April 23, 2014Key Words : Phosphoniosilylation, Epoxide opening, Three-component coupling, Enones, TBSOTfThe development of the new methods for the β-function-alization of α, β-不饱和羰基化合物一直是合成有机化学中的一个重要课题。我们小组一直有兴趣开发基于膦酰化过程的α,β-不饱和羰基化合物的β-官能化新方法。
Rhodium‐Catalyzed Annelation of Benzoic Acids with α,β‐Unsaturated Ketones with Cleavage of C−H, CO−OH, and C−C Bonds
作者:Guodong Zhang、Zhiyong Hu、Florian Belitz、Yang Ou、Nico Pirkl、Lukas J. Gooßen
DOI:10.1002/anie.201901309
日期:2019.5.6
In the presence of a [Cp*RhCl2]2 catalyst, the Lewis acid In(OTf)3, and the mild base Na2CO3, aromatic carboxylates and α,β‐unsaturated ketones undergo a unique hydroarylation/Claisen/retro‐Claisen process to give the corresponding indanones. In this carboxylate‐directed ortho‐C−H annelation, the C−COR bond of the ketone and the CO−OH group of the aromatic carboxylate are cleaved, and the hydroxy group
在[Cp * RhCl 2 ] 2催化剂,路易斯酸In(OTf)3和弱碱Na 2 CO 3的存在下,芳族羧酸盐和α,β-不饱和酮经历独特的加氢芳基化/克莱森/复古克莱森工艺给予相应的茚满酮。在这个羧酸盐定向的邻位中‐C H脱环,酮的C-COR键和芳族羧酸的CO-OH基团被裂解,羟基从芳族基转移至脂肪族酰基残基。该反应性在合成上是有用的,特别是当从环状酮开始时,该环状酮被转化为带有脂肪族羧酸盐侧链的茚满酮,因此在一个步骤中大大增加了芳香族羧酸盐的分子复杂性。
Catalytic enantioselective boron conjugate addition to cyclic carbonyl compounds: a new approach to cyclic β-hydroxy carbonyls
作者:Xinhui Feng、Jaesook Yun
DOI:10.1039/b914207j
日期:——
The highly enantioselective conjugate boration of six-membered and seven-membered cyclicenones and unsaturated esters was achieved by the use of a copper-(R,S)-Taniaphos complex with up to 99% ee under optimal conditions.
Applications of the β-Azidonation Reaction to Organic Synthesis. α,β-Enones, Conjugate Addition, and γ-Lactam Annulation
作者:Philip Magnus、Jérôme Lacour、P. Andrew Evans、Pascal Rigollier、Hans Tobler
DOI:10.1021/ja9829564
日期:1998.12.1
The β-azido functionalization reaction provides a mechanistically different enone synthesis that involves treatment of 2 with fluoride anion to effect desilylation and concomitant β-elimination to give 3. Table 1 lists a number of examples of the direct conversion of a TIPS enolether into the corresponding α,β-enone via a β-azido TIPS enolether. The β-azido group can be ionized with Me3Al or Me2AlCl
feasibility and inherent benefits of combining two distinct asymmetric transition-metal-catalyzed reactions in one pot. The reported transformation features a Pd-catalyzed asymmetricallylicalkylation and a Rh-catalyzed enantioselective 1,4-conjugate addition, effectively converting simple allyl enol carbonate precursors into enantioenrichedcyclic ketones with two remote stereocenters. Despite the anticipated