Chirality Transfer in Gold(I)-Catalysed Hydroalkoxylation of 1,3-Disubstituted Allenes
作者:Stacey Webster、Daniel R. Sutherland、Ai-Lan Lee
DOI:10.1002/chem.201603918
日期:2016.12.19
Gold(I)-catalysed intermolecularhydroalkoxylation of enantioenriched 1,3-disubstituted allenes was previously reported to occur with poor chirality transfer due to rapid allene racemisation. The first intermolecularhydroalkoxylation of allenes with efficient chirality transfer is reported here, exploiting conditions that suppress allene racemisation. A full substrate scope study reveals that excellent
Diastereoselective Borocyclopropanation of Allylic Ethers Using a Boromethylzinc Carbenoid
作者:Guillaume Benoit、André B. Charette
DOI:10.1021/jacs.6b09090
日期:2017.2.1
borocyclopropanation of (E)- and (Z)-allylic ethers and styrene derivatives via the Simmons-Smith reaction using a novel boromethylzinc carbenoid is described. The carbenoid precursor is prepared via a 3-step sequence from inexpensive and commercially available starting materials. This methodology allows for the preparation of 1,2,3-substituted borocyclopropanes in high yields and diastereoselectivities
SmCp<sup>R</sup><sub>2</sub>-mediated cross-coupling of allyl and propargyl ethers with ketoesters and a telescoped approach to complex cycloheptanols
作者:Mateusz P. Plesniak、Xavier Just-Baringo、Fabrizio Ortu、David P. Mills、David J. Procter
DOI:10.1039/c6cc07318b
日期:——
A highly regio- and diastereoselective cross-coupling of allyl/propargylethers and [small beta]-ketoesters, mediated by SmCpR2 reagents, delivers decorated [small delta]-lactones. Screening of the Cp ligands on Sm(II) was employed to achieve high...
Iodine/water-mediated deprotective oxidation of allylic ethers to access α,β-unsaturated ketones and aldehydes
作者:Yuntian Xue、Yaolong Yan、Kezhi Jiang、Weifeng Chen、Lei Yang
DOI:10.1039/d0ra02625e
日期:——
The first iodine/water-mediated deprotective oxidation of allylic ethers to accessα,β-unsaturatedketones and aldehydes was achieved. The reaction tolerates a wide range of functionalities. Furthermore, this protocol was found to be applicable to the oxidative transformation of allylic acetates. The proposed mechanism involves an oxygen transfer from solvent water to the carbonyl products.
The stereoselective cyclopropanation of chiral allylic alcohols using a chiral dioxaborolane ligand: A new route to anti-cyclopropylmethanol derivatives
作者:AndréB Charette、Hélène Lebel、Alexandre Gagnon
DOI:10.1016/s0040-4020(99)00448-2
日期:1999.7
The diastereoselective cyclopropanation reaction of allylicalcohols in the presence of the chiral dioxaborolane ligand 1 was studied. Unprecedently high anti-selectivities were obtained with E-olefins when 2.2 equivalents of bis(iodomethyl)zinc and 1.1 equivalent of 1 were used.