Action du chloroallyllithium sur les aldehydes et les cetones: synthese en une etape d'alcools β-ethyleniques γ-chlores de configuration z et d'epoxydes α-ethyleniques bi- ou tri-substitues
作者:A. Doucoure、B. Mauze、L. Miginiac
DOI:10.1016/s0022-328x(00)87068-0
日期:1982.9
Chloroallyllithium readily reacts with aliphatic and aromatic aldehydes and ketones to produce, in a one-step reaction, Z-γ-chlorinated-β-ethylenic alcohols and bi- or tri-substituted epoxides.
Synthesis of Epoxides from Alkyl Bromides and Alcohols with in Situ Generation of Dimethyl Sulfonium Ylide in DMSO Oxidations
作者:Zhi-Wei Zhang、Hai-Bo Li、Jin Li、Cui-Cui Wang、Juan Feng、Yi-Hua Yang、Shouxin Liu
DOI:10.1021/acs.joc.9b02621
日期:2020.1.17
the readily available alkyl bromides and alcohols to value-added epoxides using dimethyl sulfoxide (DMSO) under mild reaction conditions has been developed. Benzyl and allyl bromides, and activated and unactivated alcohols all proceeded smoothly to give epoxides in high to excellent yield. Dimethyl sulfide, generated by DMSO oxidations, was in situ elaborated to form the substituted dimethyl sulfonium
A facile tetrahydrothiophene-catalyzed ylide route to vinyloxiranesElectronic supplementary information (ESI) available: preparation of vinyloxiranes and chiral catalysts. See http://www.rsc.org/suppdata/cc/b3/b304443b/
作者:Kai Li、Xian-Ming Deng、Yong Tang
DOI:10.1039/b304443b
日期:——
Access to vinyloxiranes using aldehydes and allylic bromides in the presence of 1–5 mol% tetrahydrothiophene is reported. Both aliphatic and aromatic aldehydes work well in this reaction and the catalyst loading could be reduced as low as 0.5 mol%.
A first example of catalytic ylide epoxidation reaction: facile synthesis of vinyl epoxides from aldehydes catalyzed by diisobutyl telluride
作者:Zhang-Lin Zhou、Shi Li-Lan、Yao-Zeng Huang
DOI:10.1016/s0040-4039(00)97324-6
日期:1990.1
presence of cesium carbonate, a variety of aldehydes can be epoxidized directly with allyl bromide at 50°C under solid-liquid phase transfer condition by use of a catalytic amount of diisobutyl telluride to afford vinyl epoxides in good yields with predominant cis stereoselectivity.
In the presence of solid KOH, allyldi-isobutyltelluroniumbromide 2 reacts directly with aromatic aldehydes at room temperature under solid–liquid phase-transfer conditions to afford α,β-unsaturatedepoxides 3 in excellent yields.