Palladium/Brønsted Acid-Catalyzed α-Allylation of Aldehydes with Allylic Alcohols
作者:Gaoxi Jiang、Benjamin List
DOI:10.1002/adsc.201100260
日期:2011.7
A simple, highly efficient, and readily scalable direct α‐allylation of aldehydes with allylic alcohols that is co‐catalyzed by palladium and a Brønsted acid has been developed.
Facile formation of tetrahydrofurans with multiple chiral centers using double iodoetherification of σ-symmetric diene acetals: short asymmetric total synthesis of rubrenolide and rubrynolide
作者:Hiromichi Fujioka、Yusuke Ohba、Hideki Hirose、Kenji Nakahara、Kenichi Murai、Yasuyuki Kita
DOI:10.1016/j.tet.2008.02.088
日期:2008.5
novel double intramolecular iodoetherification of σ-symmetric dieneacetals from (R,R)-hydrobenzoin occurred in highly diastereoselective manners to give tetrahydrofuran moieties with multiple chiral centers in a one-pot operation. The chemoselective discrimination of the two iodomethyl functions in the products was attained in various reactions. The reaction was applied to the concise asymmetric syntheses
Rh-catalyzed desymmetrization of α-quaternary centers by isomerization-hydroacylation
作者:Jung-Woo Park、Kevin G. M. Kou、Daniel K. Kim、Vy M. Dong
DOI:10.1039/c5sc01553g
日期:——
We describe a Rh-catalyzed desymmetrization of all-carbon quaternary centers from α,α-bis(allyl)aldehydes by a cascade featuring isomerization and hydroacylation. This desymmetrization competes with two other novel olefin functionalizations that are triggered by C–H bond activation, including carboacylation and bisacylation. A BIPHEP ligand promotes enantioselective formation of α-vinylcyclopentanones
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。
Reverse Cope elimination reactions. 2. Application to synthesis
作者:Engelbert Ciganek
DOI:10.1021/jo00123a014
日期:1995.9
Intramolecular addition of N,N-disubstitute hydroxylamines to unactivated olefins was used to prepare an indolizine, a pyrrolo[2,1-a]isoquinoline, a 1,8-diazaspiro[4.5]decane, a cyclopenta[b]pyrrole, and an isoindoline. A pyrrolizine and a 1-azabicyclo[2.2.1] heptane were synthesized from acyclic precursors by two consecutive reverse Cope elimination reactions.