Copper(I)-Catalyzed Enantioselective Synthesis of α-Chiral Linear or Carbocyclic (<i>E</i>)-(γ-Alkoxyallyl)boronates
作者:Eiji Yamamoto、Yuta Takenouchi、Taichi Ozaki、Takanori Miya、Hajime Ito
DOI:10.1021/ja506284w
日期:2014.11.26
the catalytic asymmetric synthesis of α-chiral linear or carbocyclic (γ-alkoxyallyl)boronates via the copper(I)-catalyzed γ-boryl substitution of allyl acetals. This reaction afforded the products in high yields with excellent E:Z selectivities and enantioselectivities [only (E)-product, 91-98% ee] and also exhibited high functional group compatibility. Subsequent allylation of aldehydes with the α-chiral
Expeditious and stereoselective synthesis of chiral trans-β-hydroxy-δ-lactone systems starting from γ,δ-epoxy acrylates is described which involves the regioselective ring opening of an epoxide and the intramolecularconjugateaddition of a hemiacetalalkoxide anion of δ-hydroxy-α,β-unsaturated esters as key steps.
The stereoselective synthesis towards biologically active verbalactone and (+)-(3R,5R)-3-hydroxy-5-decanolide has been described. The key functionalities are derived from a chiral-auxiliary mediated acetate aldol addition, an oxa-Michael reaction and a 1,3-syn-reduction. (C) 2012 Elsevier Ltd. All rights reserved.