Boronic acid-catalysed C-3 selective ring opening of 3,4-epoxy alcohols with thiophenols and thiols
作者:Hongqing Yao、Jiawei Liu、Chuan Wang
DOI:10.1039/c8ob02141d
日期:——
In this protocol we described a boronic acid-catalysed C-3selectiveringopening of 3,4-epoxy alcohols with thiophenols and thiols as nucleophiles. This diastereo- and enantiospecific reaction provides an efficient entry to prepare a variety of hydroxyl sulfides. Through the directing effect of the hydroxyl group, nucleophilic attack on the C-3 position of the epoxide moiety is favoured. It can be
Bis-Boric Acid-Mediated Regioselective Reductive Aminolysis of 3,4-Epoxy Alcohols
作者:Wei Tang、Chuan Wang
DOI:10.1021/acs.joc.2c01878
日期:2022.11.18
Herein we report a bis-boric acid-mediated regioselective reductive aminolysis of 3,4-epoxy alcohols, providing new access to prepare amino diols in high diastereofidelity directly starting from nitroarenes. Notably, this step-economical process is enabled by the essential dual function of bis-boric acid, which is engaged initially in the 4,4′-bipyridine-catalyzed reduction of nitro compounds as the
AlEt3-promoted eliminative ring-opening of β-hydroxy epoxides: highly stereoselective synthesis of terminal α-hydroxy olefins
作者:Fei Wang、Shao Hua Wang、Yong Qiang Tu、Shi Kuo Ren
DOI:10.1016/s0957-4166(03)00457-9
日期:2003.8
AlEt3-promoted eliminative ring-opening of beta-epoxy alcohols leading to alpha-hydroxy olefins is reported. This eliminative ring-opening reaction is shown to be highly stereoselective, thus providing an alternative asymmetric synthesis for a-hydroxy olefins. (C) 2003 Elsevier Ltd. All rights reserved.
Kamata, Keigo; Hirano, Tomohisa; Kuzuya, Shinjiro, Journal of the American Chemical Society, 2009, vol. 131, p. 6997 - 7004
Bicyclic β-Hydroxytetrahydrofurans as Precursors of Medium Ring Keto-Lactones
作者:Helena M. C. Ferraz、Luiz S. Longo
DOI:10.1021/jo0626109
日期:2007.4.1
The reaction of a series of cis-fused bicyclic beta-hydroxytetrahydrofurans with ruthenium tetraoxide, generated in situ from ruthenium trichloride and sodium periodate, afforded 9- and 10-membered keto-lactones in moderate to good yields, in a clean and straightforward fashion. The starting beta-hydroxyethers were obtained from the corresponding 3-alkenols by two alternative procedures, depending on their pattern of substitution: (a) epoxidation by dimethyldioxirane, followed by base-catalyzed cyclization of the resulting epoxyalcohol, and (b) thallium trinitrate-mediated cyclization of the 3-alkenols, a method already described by our group.