Oxidative Rearrangements of Isobenzofurans: Studies toward the Synthesis of the Ajudazols
摘要:
We present a new facet of isobenzofuran chemistry which allows for its efficient manipulation to generate biologically relevant entities. This methodology has been successfully applied toward the synthesis of ajudazol A.
Chiral terpene auxiliaries III: spiroborate esters from (1R,2S,3R,5R)-3-amino-apopinan-2-ol as highly effective catalysts for asymmetric reduction of ketones with borane
摘要:
New spiroborate esters, derived from terpene amino alcohols, (S)-prolinol, and 2-aminoethanol, were employed as catalysts in the borane reduction of acetophenone and other aryl alkyl and halogenated ketones. The corresponding alcohols were obtained in high yields and with enantioselectivities up to 98% ee. The influence of the amino alcohol and the diol moieties of spiroborate on the reaction selectivity was examined. The catalyst load, the nature of the solvent, the borane source, and the reaction conditions were also investigated. (c) 2015 Elsevier Ltd. All rights reserved.
Chiral terpene auxiliaries IV: new monoterpene PHOX ligands and their application in the catalytic asymmetric transfer hydrogenation of ketones
作者:Anna Kmieciak、Marek P. Krzemiński
DOI:10.1016/j.tetasy.2017.02.003
日期:2017.3
New PHOX ligands, derived in three steps from (1R,2S,3R,5R)-3-amino-apopinan-2-ol 1 and (1R,2R,3S,5R)-3-amino-pinan-2-ol 2 were applied as chiral ligands for the formation of ruthenium catalysts. The catalysts were used in asymmetric transfer hydrogenations of prochiral ketones producing the corresponding alcohols in moderate to high yields and enantioselectivity. (C) 2017 Elsevier Ltd. All rights reserved.
Chiral terpene auxiliaries III: spiroborate esters from (1R,2S,3R,5R)-3-amino-apopinan-2-ol as highly effective catalysts for asymmetric reduction of ketones with borane
作者:Marta Ćwiklińska、Marek P. Krzemiński、Agnieszka Tafelska-Kaczmarek
DOI:10.1016/j.tetasy.2015.10.018
日期:2015.12
New spiroborate esters, derived from terpene amino alcohols, (S)-prolinol, and 2-aminoethanol, were employed as catalysts in the borane reduction of acetophenone and other aryl alkyl and halogenated ketones. The corresponding alcohols were obtained in high yields and with enantioselectivities up to 98% ee. The influence of the amino alcohol and the diol moieties of spiroborate on the reaction selectivity was examined. The catalyst load, the nature of the solvent, the borane source, and the reaction conditions were also investigated. (c) 2015 Elsevier Ltd. All rights reserved.
Oxidative Rearrangements of Isobenzofurans: Studies toward the Synthesis of the Ajudazols
作者:Stephen J. Hobson、Andrew Parkin、Rodolfo Marquez
DOI:10.1021/ol8009336
日期:2008.7.3
We present a new facet of isobenzofuran chemistry which allows for its efficient manipulation to generate biologically relevant entities. This methodology has been successfully applied toward the synthesis of ajudazol A.