Methyl (5R)-5-hydroxy-3-methylidenedecanoate as a promising building block in asymmetric syntheses of bioactive natural compounds
摘要:
Simple and efficient asymmetric syntheses of several lactones with the use of methyl (5R)-5-hydroxy-3-methylidenedecanoate as a polyfunctional building block are described.
Asymmetric Synthesis of α,β-Unsaturated δ-Lactones through Copper(I)-Catalyzed Direct Vinylogous Aldol Reaction
作者:Hai-Jun Zhang、Liang Yin
DOI:10.1021/jacs.8b07929
日期:2018.9.26
for the asymmetric synthesis of chiral α,β-unsaturated δ-lactones was achieved by copper(I)-catalyzed direct vinylogous aldol reaction (DVAR) of β,γ-unsaturated esters and various aldehydes, including aromatic aldehydes, heteroaromatic aldehydes, α,β-unsaturated aldehydes, and aliphatic aldehydes. For aromatic and heteroaromatic aldehydes, a one-pot reaction consisting of DVAR, isomerization of the
We have succeeded in the easy preparation of optically active 1,2-diol monotosylates bearing an unsaturated substituent via enzymatic hydrolysis. Lipase PS quickly catalyzes the hydrolyses of 2-acetoxybut-3-enyl tosylate, which has a double bond, and 2-acetoxybut-3-ynyl tosylate, which has a triple bond, with excellent enantioselectivity to afford the corresponding optically active compounds. The reaction
A new synthetic route to optically active unsaturated gamma- and delta-lactones has been demonstrated via asymmetric allylic carboxylation with a planar-chiral Cp'Ru catalyst and ring-closingmetathesis reaction with a Grubbs II catalyst, and successfully applied to the enantioselective synthesis of (R)-(-)-massoialactone.
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
Rationally Designed Chiral Synthons Enabling Asymmetric <i>Z</i>- and <i>E</i>-Selective Vinylogous Aldol Reactions of Aldehydes
作者:Akhil Padarti、Hyunsoo Han
DOI:10.1021/acs.orglett.8b00230
日期:2018.3.2
In a conceptually different approach, highly stereoselective 2-oxonia-Cope rearrangement reactions between rationally designed nonracemic vinylogous aldolation synthons and aldehydes are described to provide δ-hydroxy-α,β-unsaturated esters with excellent enantioselectivities and, for the first time, unprecedented Z- and E-selectivities without the regioselectivity issue.