Enantioselective Synthesis of Anti Homoallylic Alcohols from Terminal Alkynes and Aldehydes Based on Concomitant Use of a Cationic Iridium Complex and a Chiral Phosphoric Acid
We report a highly diastereo- and enantioselective synthesis of anti homoallylic alcohols fromterminalalkynes via (E)-1-alkenylboronates based upon two catalytic reactions: a cationic iridium complex-catalyzed olefin transposition of (E)-1-alkenylboronates and a chiral phosphoric acid-catalyzed allylation reaction of aldehydes.
Zirconocene-catalyzed kinetic resolution of dihydrofurans
作者:Michael S. Visser、Amir H. Hoveyda
DOI:10.1016/0040-4020(94)01127-l
日期:1995.4
Zisconocene-catalyzed kinetic resolution of dihydrofurans may be effected in the presence of 10 mol% non-racemic (EBTHI)ZrCl2. Transformations reported herein proceed efficiently to afford two constitutionally distinct and readily separable products with excellent levels of diastereo- and enantioselectivity. Preparation and resolution of the substrate furans may be carried out in a single pot.
A Novel Synthesis of (
<i>E</i>
)‐2‐Alkenylborane from Chiral Borane and Diazoalkene: Asymmetric Alkenylboration of Aldehydes