Highly Stereoselective Intramolecular Diels–Alder Reaction of Decatrienoates Activated by<i>t</i>-Butoxycarbonyl, Chloro, and Sulfonyl Groups at the Terminal Position
HighlystereoselectiveintramolecularDiels–Alder (IMDA) reaction of decatrienoates has been achieved by using a more sterically hindered ester group, i.e., t-butoxycarbonyl, or electron-withdrawin...
QUINOLONE DERIVATIVE OR PHARMACEUTICALLY ACCEPTABLE SALT THEREOF
申请人:Astellas Pharma Inc.
公开号:EP1995240B1
公开(公告)日:2012-02-22
Diastereoselective Construction of <i>syn</i>-1,3-Dioxanes via a Bismuth-Mediated Two-Component Hemiacetal/Oxa-Conjugate Addition Reaction
作者:P. Andrew Evans、Aleksandr Grisin、Michael J. Lawler
DOI:10.1021/ja208668u
日期:2012.2.15
The bismuth-mediated two-component hemiacetal/oxa-conjugate addition of delta-trialkylsilyloxy and delta-hydroxy alpha,beta-unsaturated aldehydes and ketones with alkyl aldehydes provides the syn-1,3-dioxanes in a highly efficient and stereoselective manner. The key advantages of this protocol are its operational simplicity and its ability to directly access electron-withdrawing groups without recourse to oxidation state adjustments.