Formation of Chiral Allylic Ethers via an Enantioselective Palladium-Catalyzed Alkenylation of Acyclic Enol Ethers
作者:Harshkumar H. Patel、Matthew B. Prater、Scott O. Squire、Matthew S. Sigman
DOI:10.1021/jacs.8b02751
日期:2018.5.9
palladium-catalyzed process to access highly functionalized, optically active allylic aryl ethers. A number of electron-deficient alkenyl triflates underwent enantioselective and site-selective coupling with acyclic aryl enol ethers in the presence of a chiral palladium catalyst. This transform provides chiral allylicether products in high yields and excellent enantiomeric ratios, furnishing a unique
An Ireland−Claisen Approach to β-Alkoxy α-Amino Acids
作者:James P. Tellam、Gabriele Kociok-Köhn、David R. Carbery
DOI:10.1021/ol802169j
日期:2008.11.20
A diastereoselective Ireland-Claisen approach to beta-alkoxy alpha-amino acid esters is reported. Amino acid esters of enol ethereal allylic alcohols undergo facile syn-selective [3,3]-sigmatropic rearrangement via silyl keteneacetals. Substrate synthesis, rearrangement development, stereoselectivity, and product elaboration are discussed.
Development of the Ireland−Claisen Rearrangement of Alkoxy- and Aryloxy-Substituted Allyl Glycinates
作者:James P. Tellam、David R. Carbery
DOI:10.1021/jo1017124
日期:2010.11.19
The Ireland−Claisenrearrangement of 3-alkoxy- and 3-aryloxy-substituted allyl glycinates is presented. This [3,3]-sigmatropic rearrangement route offers direct access to syn β-alkoxy and β-aryloxy α-amino acid systems. In particular, N,N-diboc glycine esters rearrange with excellent diastereoselectivities (dr > 25:1). The synthesis of substrates, rearrangement optimization, and a discussion of stereoselection
Enantioselective C2‐Alkylation of Indoles through a Redox‐Relay Heck Reaction of 2‐Indole Triflates
作者:Nicholas J. Race、Qianjia Yuan、Matthew S. Sigman
DOI:10.1002/chem.201805416
日期:——
enantioselective redox‐relay Heck reaction of 2‐indole triflates and disubstituted alkenes is reported. This process combines readily available indole triflates with a variety of alkenes to afford a range of indole derivatives bearing a stereocenter adjacent to C2. Enantioselectivity is achieved through use of a simple pyridine‐oxazoline ligand. Tuning the electronics of the indole, through judicious choice of N‐protecting