Nickel-Catalyzed Enantioselective Synthesis of Pre-Differentiated Homoallylic <i>syn</i>- or <i>anti</i>-1,2-Diols from Aldehydes and Dienol Ethers
作者:Thomas Q. Davies、John J. Murphy、Maxime Dousset、Alois Fürstner
DOI:10.1021/jacs.1c07042
日期:2021.9.1
Nickelcatalysis allied with cyclodiphosphazane or VAPOL-derived phosphoramidite ligands provides selective access to monoprotected vicinal diols by reductive coupling of dienol ethers and aldehydes. The observed regioselectivity is unprecedented, in that the diene reacts at the least nucleophilic and most hindered C atom that is attached to the oxygen substituent rather than at the terminal position
镍催化与环二磷氮烷或 VAPOL 衍生的亚磷酰胺配体结合,通过二烯醇醚和醛的还原偶联提供对单保护的邻二醇的选择性访问。观察到的区域选择性是前所未有的,因为二烯在亲核性最低且受阻最大的 C 原子上反应,该 C 原子连接到氧取代基而不是在末端位置。值得注意的是,产品的顺式和反式非对映异构体都可以根据二烯伙伴的配置获得,通常具有出色的非对映选择性和对映选择性。
Tandem Asymmetric Cyclopropanation/Cope Rearrangement. A Highly Diastereoselective and Enantioselective Method for the Construction of 1,4-Cycloheptadienes
作者:Huw M. L. Davies、Douglas G. Stafford、Brian D. Doan、Jeffrey H. Houser
DOI:10.1021/ja974201n
日期:1998.4.1
rhodium(II) (N-dodecylbenzenesulfonyl)prolinate (Rh2(S-DOSP)4, 1) in the presence of dienes results in a direct and highly enantioselective method for the formation of cis-divinylcyclopropanes. Combination of this process with a subsequent Cope rearrangement results in a highly enantioselective synthesis of a variety of cycloheptadienes containing multiple stereogenic centers.
在二烯存在下,通过铑 (II) (N-十二烷基苯磺酰基) 脯氨酸 (Rh2(S-DOSP)4, 1) 分解乙烯基重氮乙酸酯,可以直接且高度对映选择性地形成顺式二乙烯基环丙烷。该过程与随后的 Cope 重排相结合,导致多种含有多个立体中心的环庚二烯的高度对映选择性合成。
Stereocontrolled Synthesis of a Potential Transition-State Inhibitor of the Salicylate Synthase MbtI from <i>Mycobacterium tuberculosis</i>
作者:Zheng Liu、Feng Liu、Courtney C. Aldrich
DOI:10.1021/acs.joc.5b00455
日期:2015.7.2
chorismate into salicylic acid via isochorismate. We report the design, synthesis, and biochemical evaluation of an inhibitor based on the putative transitionstate (TS) for the isochorismatase partial reaction of MbtI. The inhibitor mimics the hypothesized charge buildup at C-4 of chorismate in the TS as well as C–O bond formation at C-6. Another important design element of the inhibitor is replacement of
Our third generation synthesis of Tamiflu was achieved in 12 steps from commercially available starting materials, using the Diels–Alder reaction and Curtius rearrangement as key steps.
The ‘Mikami’-Catalyst in Enantioselective Diels–Alder Reactions of Juglone-Based Dienophiles with Different 1-Oxygenated Dienes: An Investigation on the Substitution Pattern Dependent Regioselectivity
作者:Jörg Pietruszka、Dietrich Böse、Wolfgang Frey
DOI:10.1055/s-0034-1378230
日期:——
investigating the substitution pattern depending regioselectivity of enantioselective BINOL-Ti-catalyzed Diels–Alderreactions of juglone-based dienophiles with 1-oxygenated dienes is reported. The different influences of residues both on the diene as well as on the dienophiles are investigated giving a detailed picture of their role on the regioselectivity. A mechanistic study investigating the substitution