Biology‐oriented synthesis employs the structural information encoded in complex natural products to guide the synthesis of compoundcollections enriched in bioactivity. The trans‐hydrindane dehydro‐δ‐lactone motif defines the characteristic scaffold of the steroid‐like withanolides, a plant‐derived natural product class with a diverse pattern of bioactivity. A withanolide‐inspired compoundcollection was synthesized
Rhodium(II)- or Copper(I)-Catalyzed Formal Intramolecular Carbene Insertion into Vinylic C(sp<sup>2</sup>
)−H Bonds: Access to Substituted 1<i>H</i>
-Indenes
作者:Qi Zhou、Shichao Li、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201709375
日期:2017.12.11
A rhodium(II)‐ or copper(I)‐catalyzed formal intramolecular carbene insertion into vinylic C(sp2)−H bonds is reported herein. This method provides straightforward access to 1H‐indenes with high efficiency and excellent functional‐group compatibility. Mechanistically, the reaction is proposed to involve the following sequence: metal carbene formation, intramolecular nucleophilic addition of the double
This work highlights the use of 3-vinyl-1,2,4-triazines as original thia-Michael acceptors and inverse electron demanding Diels-Alder platforms en route to new 7,8-dihydro-5H-thiopyrano[4,3-b]pyridines. The required but rather unstable propargylthiol nucleophiles were successfully generated in-situ upon an innovative DBU-catalyzed methanolysis event of the corresponding propargyl thioacetate derivatives
这项工作强调了将3-乙烯基-1,2,4-三嗪用作原始的thia-Michael受体和要求反电子的Diels-Alder平台,用于新的7,8-dihydro-5 H -thiopyrano [4,3- b ]吡啶。所需但相当不稳定的炔丙基硫醇亲核试剂是在相应的炔丙基硫代乙酸酯衍生物的创新性DBU催化甲醇分解事件中成功地原位生成的。
Rhodium-Catalyzed Asymmetric Conjugate Addition of Arylboroxines to Borylalkenes: Asymmetric Synthesis of β-Arylalkylboranes
作者:Keigo Sasaki、Tamio Hayashi
DOI:10.1002/anie.201004980
日期:2010.10.25
Asymmetricconjugateaddition of arylboroxines to borylalkenes proceed in the presence of a chiral bisphosphine/rhodium complex as a catalyst to give chiral β‐arylalkylboranes with high enantioselectivities (see scheme). [O]=H2O2/NaOH.
在手性双膦/铑配合物作为催化剂的存在下,芳基硼氧烷与硼烷基烯烃的不对称共轭加成反应产生具有高对映选择性的手性β-芳基烷基硼烷(参见方案)。[O] = H 2 O 2 / NaOH。
Carboxylation of Alkenyl Boronic Acids and Alkenyl Boronic Acid Pinacol Esters with CO<sub>2</sub>
Catalyzed by Cuprous Halide
作者:Junting Hong、Onkar S. Nayal、Fanyang Mo
DOI:10.1002/ejoc.202000288
日期:2020.5.22
Three kinds of alkenylboron compounds were effectively transformed into the corresponding α, β‐unsaturated carboxylic acids in moderate to high yields through a cuprous halide catalyzed carboxylation with CO2. The advantages of this method include low cost, mild conditions, simple operation, broad scope, and external ligand free.