A Second-Generation Synthesis of the Cyanthiwigin Natural Product Core
作者:Kelly E. Kim、Brian M. Stoltz
DOI:10.1021/acs.orglett.6b02962
日期:2016.11.4
An improved synthesis of the cyanthiwigin naturalproductcore enabled by new catalytic technology is reported. The key double catalytic enantioselective alkylation has been reoptimized using a recently developed protocol employing low loadings of palladium catalyst, thereby facilitating large-scale production of the tricyclic cyanthiwigin framework. Additionally, preparation of the penultimate aldehyde
An Efficient Protocol for the Palladium-Catalyzed Asymmetric Decarboxylative Allylic Alkylation Using Low Palladium Concentrations and a Palladium(II) Precatalyst
作者:Alexander N. Marziale、Douglas C. Duquette、Robert A. Craig、Kelly E. Kim、Marc Liniger、Yoshitaka Numajiri、Brian M. Stoltz
DOI:10.1002/adsc.201500253
日期:2015.7.6
catalytic allylic alkylation for the synthesis of 2‐alkyl‐2‐allylcycloalkanones and 3,3‐disubstituted pyrrolidinones, piperidinones and piperazinones has been previously reported by our laboratory. The efficient construction of chiral all‐carbon quaternary centers by allylic alkylation was previously achieved with a catalyst derived in situ from zero‐valent palladium sources and chiral phosphinooxazoline
Enantioselective Synthesis of the 5–6–7 Carbocyclic Core of the Gagunin Diterpenoids
作者:Grant M. Shibuya、John A. Enquist、Brian M. Stoltz
DOI:10.1021/ol401514s
日期:2013.7.5
A catalytic enantioselective double allylic alkylation reaction has been employed in the synthesis of the core of the gagunin diterpenoids. Enantioenriched material was advanced in 11 steps to afford the core of the highly oxygenated target, which includes two all-carbon quaternary stereocenters.
ASYMMETRIC CATALYTIC DECARBOXYLATIVE ALKYL ALKYLATION USING LOW CATALYST CONCENTRATIONS AND A ROBUST PRECATALYST
申请人:Stoltz Brian M.
公开号:US20160280623A1
公开(公告)日:2016-09-29
This invention provides efficient and scalable enantioselective methods that yield 2-alkyl-2-allylcycloalkyanone compounds with quaternary stereogenic centers. Methods include the method for the preparation of a compound of formula (I):
comprising treating a compound of formula (II) or (III):
with a palladium (II) catalyst under alkylation conditions.