An Efficient Three-Component One-Pot Approach to the Synthesis of 2,3,4,5-Tetrahydro-1H-2-benzazepines by Means of Rhodium-Catalyzed Hydroaminomethylation
摘要:
We have developed a novel and efficient three-component one-pot, catalytic approach for the synthesis of 2,3,4,5-tetrahydro-1H-2-benzazepines, using a rhodium catalyst that does not require phosphine. The isolated yields are excellent and the protocol tolerates anilines of diverse basicity.
Copper-Catalyzed Annulation–Trifluoromethyl Functionalization of Enynones
作者:Jia-Yin Wang、Sai Zhang、Yao Tang、Shenghu Yan、Guigen Li
DOI:10.1021/acs.orglett.3c00679
日期:2023.4.14
of quaternary carbon-centered 1-indanones in moderate to good chemical yields. The reaction of enynones with Togni’s reagent and chloro- or bromotrimethylsilane afforded halo- and CF3-containing 1-indenones. However, the addition of K3PO4 as a base into the catalytic system led to forming cyano-anchored (Z)-1-indanones as major stereoisomeric products. This strategy exhibits remarkable compatibility
已经建立了 Cu(I) 催化的烯酮的环化-卤代三氟甲基化和氰基三氟甲基化,能够以中等到良好的化学产率合成以季碳为中心的 1-茚满酮的多键形成。烯酮与 Togni 试剂和氯代或溴代三甲基硅烷反应,得到含卤素和 CF 3的 1-茚酮。然而,将 K 3 PO 4作为碱添加到催化体系中导致形成氰基锚定的 ( Z )-1-茚满酮作为主要的立体异构产物。该策略表现出与多种烯酮的显着相容性。
Continuous‐Flow Enantioselective Hydroacylations under Heterogeneous Chiral Rhodium Catalysts
作者:Yuki Saito、Shū Kobayashi
DOI:10.1002/anie.202313778
日期:2024.1.2
Heterogeneous chiral Rh catalysts were developed for continuous-flow enantioselective hydroacylations. The prepared catalysts exhibited excellent activity and enantioselectivity affording optically active ketones in quantitative yields with 99 % ee's without the leaching of Rh. The catalysts exhibited a wide substrate scope and, in sequential-flow reactions, the flow syntheses of value-added chemicals
开发了用于连续流对映选择性加氢酰化的非均相手性 Rh 催化剂。所制备的催化剂表现出优异的活性和对映选择性,以定量产率提供光学活性酮,其 ee 为 99%,且没有 Rh 浸出。该催化剂表现出广泛的底物范围,并且在顺序流动反应中,证明了增值化学品的流动合成。