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.
Remote Stereocontrol in [3,3]-Sigmatropic Rearrangements: Application to the Total Synthesis of the Immunosuppressant Mycestericin G
作者:Nathan W. G. Fairhurst、Mary F. Mahon、Rachel H. Munday、David R. Carbery
DOI:10.1021/ol203300k
日期:2012.2.3
3]-sigmatropic rearrangement has been used to access biologically important β,β′-dihydroxy α-amino acids. The rearrangement reported is highly stereoselective and offers excellent levels of remotestereocontrol. This strategy has been used to synthesize the natural immunosuppressant mycestericin G and ent-mycestericin G, allowing for a revision of absolute configuration of this natural product.
Polymer supported perruthenate (PSP): a new oxidant for clean organic synthesis
作者:Berthold Hinzen、Steven V. Ley
DOI:10.1039/a703461j
日期:——
A polymer supported perruthenate reagent has been prepared and
used in the conversion of primary and secondary alcohols to aldehydes
and ketones, respectively, affording pure products without the need for
conventional work-up procedures.
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
Stereoselective synthesis of cis- and trans-2,3-disubstituted eight-membered medium-ring ethers based on Ireland–Claisen rearrangement of 3-alkoxy-2-propenyl glycolate esters and ring-closing olefin metathesis
A simple stereoselective synthesis of cis- and trans-2,3-disubstituted medium-sized cyclic ethers has been developed based on geometry-selective synthesis of 3-alkoxy-2-propenyl glycolate esters, Ireland–Claisen rearrangement of the glycolate esters, and ring-closing olefin metathesis.