An Efficient Formal Total Synthesis of Cladosporin
作者:Debendra K. Mohapatra、Saurabh Maity、T. Srinivasa Rao、J. S. Yadav、B. Sridhar
DOI:10.1002/ejoc.201300053
日期:2013.5
A highly diasteroselective and efficient approach for the formaltotalsynthesis of cladosporin is described. Cross-metathesis, iodocyclization to construct the trans-2,6-disubstituted dihydropyran ring system, and an Alder–Rickert reaction to form the aromatic ring were used as the key steps.
Proline-Catalyzed One-Step Asymmetric Synthesis of 5-Hydroxy-(2<i>E</i>)-hexenal from Acetaldehyde
作者:Armando Córdova、Wolfgang Notz、Carlos F. Barbas
DOI:10.1021/jo015881m
日期:2002.1.1
For the first time, the L-proline-catalyzed direct asymmetric self-aldolization of acetaldehyde is described affording (+)-(5S)-hydroxy-(2E)-hexenal 2 with ee's ranging from 57 to 90%. Further transformations of 2 into synthetically valuable building blocks are presented. A mechanism for the formation of 2 is proposed.