Journal
TETRAHEDRON LETTERS
Volume 48, Issue 18, Pages 3305-3309Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.02.124
Keywords
-
Categories
Ask authors/readers for more resources
Chiral alpha-substituted allylic boronates are attractive reagents that add to aldehydes with very high stereoselectivity. This study examined the feasibility of an improved method of preparation based on the catalytic asymmetric allylic alkylation of simple 3-hydroxy-1-propenylboronate derivatives with malonate anions. Whereas palladium catalysis failed in promoting the desired process, iridium catalysis led to a regioselective formation of the desired, branched allylboronates with up to 84% ee using a chiral monophosphoramidite ligand. This allylation reagent adds to aldehydes with high chirality transfer. A diastereoselective alkoxycyclization on the resulting homoallylic alcohols allows a separation of the epimeric E/Z isomers. (c) 2007 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available