作者:Douglas C. Behenna、Justin T. Mohr、Nathaniel H. Sherden、Smaranda C. Marinescu、Andrew M. Harned、Kousuke Tani、Masaki Seto、Sandy Ma、Zoltán Novák、Michael R. Krout、Ryan M. McFadden、Jennifer L. Roizen、John A. Enquist、David E. White、Samantha R. Levine、Krastina V. Petrova、Akihiko Iwashita、Scott C. Virgil、Brian M. Stoltz
DOI:10.1002/chem.201003383
日期:2011.12.9
functions with nearly identical efficiency in terms of yield and enantioselectivity. Catalyst discovery and development, the optimization of reaction conditions, the exploration of reactionscope, and applications in target‐directed synthesis are reported. Experimental observations suggest that these alkylationreactions occur through an unusual inner‐sphere mechanism involving binding of the prochiral
The first enantiocontrolled total synthesis of (â)-goniomitine, a new structural type of indole alkaloid of the Aspidosperma family isolated from the root bark of Gonioma malagasy, has been completed starting from a chiral cyclopentadienone synthon and establishes the absolute stereochemistry as 20R, 21S.
Palladium-Catalyzed Enantioselective Decarboxylative Allylic Alkylation of Cyclopentanones
作者:Robert A. Craig、Steven A. Loskot、Justin T. Mohr、Douglas C. Behenna、Andrew M. Harned、Brian M. Stoltz
DOI:10.1021/acs.orglett.5b02376
日期:2015.11.6
The first general method for the enantioselective construction of all-carbon quaternary centers on cyclopentanones by enantioselective palladium-catalyzed decarboxylative allylic alkylation is described. Employing the electronically modified (S)-(p-CF3)(3)-t-BuPHOX ligand, alpha-quaternary cyclopentanones were isolated in yields up to >99% with ee's up to 94%. Additionally, in order to facilitate large-scale application of this method, a low catalyst loading protocol was employed, using as little as 0.15 mol % Pd, furnishing the product without any loss in ee.