Diastereoselective Construction of syn-1,3-Dioxanes via a Bismuth-Mediated Two-Component Hemiacetal/Oxa-Conjugate Addition Reaction
摘要:
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.
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.