Game, set, and match: The first regio‐ and enantioselective version of the title reaction is described. The chiral catalyst prepared in situ from CrCl3 and a non‐C2‐symmetric bis(oxazoline) ligand 1 affords the valuable chiral β‐allenols regioselectively in good yields with excellent ee values. R=aryl, alkyl.
Dramatic solvent effect is observed during the cyclization of 1. Synthesis of 2 is achieved from the reaction of I with a hexamethylditin-catalyzed palladium complex followed by aldehydes in the presence of TMSOTf in THF, whereas 3 is formed in CH2Cl2. The method described herein is successful with various substrates 1 in good yields and high levels of diastereoselectivity.
Palladium-Catalyzed Three-Component Transformation of Homoallenols: A Regio- and Stereoselective Route to 1,5-Amino Alcohols
作者:Miriam Aylward、Vincent Coeffard、Patrick J. Guiry
DOI:10.1021/jo1025628
日期:2011.5.6
A palladium-catalyzed three-component transformation of enantioenriched homoallenols with aryl halides and amines has been developed to selectively afford (Z)-configured 1,5-amino alcohols in good-to-excellent yields without any epimerization.
A novel allylic transfer reaction of chirally modified 2-borylbutadiene: synthesis of chiral homoallenyl alcohols
作者:Jihoon Choi、Bobin Lee、Chan-Mo Yu
DOI:10.1039/c0cc05751g
日期:——
An enantioselective synthesis of the homoallenyl alcohols was achieved from the reaction of chiral 2-borylbutadiene with aldehydes through an allylictransfer reaction in good yields and enantioselectivities.