[EN] METHODS AND COMPOSITIONS FOR TERPENOID SYNTHESIS<br/>[FR] PROCÉDÉS ET COMPOSITIONS POUR LA SYNTHÈSE DE TERPÉNOÏDES
申请人:UNIV FLORIDA
公开号:WO2018053322A1
公开(公告)日:2018-03-22
In one aspect, the disclosure relates to methods for preparation of terpene and terpene-like molecules. In a further aspect, the disclosure relates to the products of the disclosed methods, i.e., terpene and terpene-like molecules prepared using the disclosed methods. Intermediates for the synthesis of a wide variety of terpenoids are γ-allyl Knoevenagel adducts or quasi γ-allyl Knoevenagel adducts are disclosed. In various aspects, methods of preparing terpenoids through these intermediates are disclosed. The methods can comprise α-alkylation of an allylic electrophile followed by ring-closure metathesis to a polycyclic terpenoid structure. In a further aspect, the disclosure pertains to terpenoid frameworks, and compounds prepared via disclosed oxidation and substitution reactions on the disclosed terpenoid frameworks. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.
A Mild Method for the Replacement of a Hydroxyl Group by Halogen: 4. Practical Synthesis of Cyclic β-Halovinylketones under Neutral Conditions
作者:Léon Ghosez、François Munyemana
DOI:10.1055/a-2017-4685
日期:——
deoxyhalogenation reactions of the enol tautomers of cyclic1,3-diketones and of 2-hydroxymethylene cycloketones can also be performed with TMCE or DIXE to yield β-halo-α,β-unsaturated ketones in excellent yields. The reactions are regioselective and in some cases stereoselective. The reaction is also successful with acetylacetone but the yield is only moderate. β-Ketoesters are not reactive. The method favorably
Regioselective Alkylations of Cyclic 1,3-Diketonesvia Metalated Dimethylhydrazones
作者:Ayhan S. Demir、Dieter Enders
DOI:10.1002/prac.19973390199
日期:——
Cyclic 1,3- diketones 1 are transformed into their 2,2-dimethylhydrazones 2, which can be alkylated regioselectively at different positions after mono-, di-, tri-, and tetrametalation. Monometalated C-2 unsubstituted hydrazones afford C-2 and N-alkylation, monometalated C-2 substituted hydrazones afford only C-2 alkylation. The regioselectivity of the alkylation of the polymetalated hydrazones follows Hauser's rule according to the sequence: NH- > C-4 Ha > C-5 > C-4 Hb. Hydrolysis of the product hydrazones 3-5 afforded mono-and polyalkylated 1,3- diketones 7 in good yields.
Synthesis of dihydrochalcones of Myrica gale
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DOI:10.1016/s0031-9422(00)88754-3
日期:1978.1
Photocatalytic degradation of water taste and odour compounds in the presence of polyoxometalates and TiO2: Intermediates and degradation pathways
作者:Theodora Fotiou、Theodoros M. Triantis、Triantafyllos Kaloudis、Elias Papaconstantinou、Anastasia Hiskia