A Concise Enantioselective Synthesis of (−)-Ranirestat
作者:Barry M. Trost、Maksim Osipov、Guangbin Dong
DOI:10.1021/ol100167w
日期:2010.3.19
A concise, enantioselective synthesis of the potent aldose reductaseinhibitor ranirestat (1) is reported. The synthesis was accomplished employing inexpensive, commercially available starting materials. A palladium-catalyzed asymmetric allylic alkylation (Pd-AAA) of malonate 4 was utilized as a key transformation to construct the tetrasubstituted chiral center in the target.
Direct Catalytic Enantioselective Benzylation from Aryl Acetic Acids
作者:Patrick J. Moon、Zhongyu Wei、Rylan J. Lundgren
DOI:10.1021/jacs.8b11390
日期:2018.12.19
We demonstrate that metal-catalyzed enantioselective benzylation reactions of allylic electrophiles can occur directly from aryl acetic acids. The reaction proceeds via a pathway in which decarboxylation is the terminal event, occurring after stereoselective carbon-carbon bond formation. This mechanistic feature enables enantioselective benzylation without the generation of a highly basic nucleophile
an aromaticaldehyde for use in asymmetric synthesis. The reaction between aromaticaldehydes and aryl or allyl electrophiles with a silylboronate utilizing a chiral copper-N-heterocyclic carbene catalyst and a palladium-bisphosphine catalyst in a synergistic manner occurred with high enantioselectivities to deliver the three-component coupling products, chiral silyl-protected secondary alcohol derivatives
Uniting C1-Ammonium Enolates and Transition Metal Electrophiles via Cooperative Catalysis: The Direct Asymmetric α-Allylation of Aryl Acetic Acid Esters
作者:Kevin J. Schwarz、Jessica L. Amos、J. Cullen Klein、Dung T. Do、Thomas N. Snaddon
DOI:10.1021/jacs.6b01694
日期:2016.4.27
constitutes a significant challenge in the area of asymmetric catalysis, particularly where the configurational integrity of the products is problematic. Through the unprecedented merger of two independent, yet complementary, catalysis events it has been possible to facilitate the direct asymmetric α-allylation of readily available aryl aceticacid esters. Since enantioselection is determined by the nucleophile
Enantioselective Syntheses of
<i>Strychnos</i>
and
<i>Chelidonium</i>
Alkaloids through Regio‐ and Stereocontrolled Cooperative Catalysis
作者:Luke S. Hutchings‐Goetz、Chao Yang、James W. B. Fyfe、Thomas N. Snaddon
DOI:10.1002/anie.202005151
日期:2020.9.28
We describe enantioselective syntheses of strychnos and chelidonium alkaloids. In the first case, indole acetic acid esters were established as excellent partner nucleophiles for enantioselective cooperative isothiourea/Pd catalyzed α‐alkylation. This provides products containing indole‐bearing stereocenters in high yield and with excellent levels of enantioinduction in a manner that is notably independent