Asymmetric Allylation/RCM-Mediated Synthesis of Fluorinated Benzo-Fused Bicyclic Homoallylic Amines As Dihydronaphthalene Derivatives
作者:Daniel M. Sedgwick、Pablo Barrio、Antonio Simón、Raquel Román、Santos Fustero
DOI:10.1021/acs.joc.6b01590
日期:2016.10.7
Enantiomericallyenriched fluorinated benzo-fused bicyclic homoallylic amines have been synthesized through an asymmetricallylation/ring closing metathesis (RCM) sequence. This sequence has been carried out using α-trifluoromethylstyrene derivatives as key intermediates, synthesized by microwave radiation. The great deactivating effect exerted by such substituents has been brought to light by a comparative
Addition conjuguée d'organométalliques sur des mésitylcétones α-éthyléniques
作者:F. Barbot、D. N'Goma、Ph. Miginiac
DOI:10.1016/0022-328x(91)83001-k
日期:1991.6
of α-ethylenic mesitylketones with a series of organometallic compounds including allylic organometallics and organolithium compounds proceed via exclusive conjugatedadditions as a result of the steric congestion of the carbonyl of these ketones.
Stereoselective allylation of 2-formyl amides or 3-oxo amides has been studied. Treatment of 2-formyl-N,N-dimethylpropanamide (1a) with allylzinc bromide gave 3-hydroxy-2,N,N-trimethyl-5-pentenamide as a stereoisomeric mixture (2a : 3a = 63 : 37). Meantime, the reaction of 1a with allyltrimethylsilane in the presence of Lewis acid such as EtAlCl2 or BF3·OEt2 afforded threo-adduct 2a exclusively. Whereas treatment of 2-benzoyl-N,N-dimethylpropanamide (PhCOCH(Me)CONMe2) with allylzinc bromide provided erythro-3-hydroxy-2-methyl-3-phenyl-5-hexenamide with high stereoselectivity, allylation with allylsilane in the presence of a catalytic amount of n-Bu4NF afforded stereoisomeric threo hydroxy amide exclusively.
Etude du comportement d'organometalliques (M = Zn, Mg, Li) vis a vis d'enynes conjuges
作者:D. Mesnard、L. Miginiac
DOI:10.1016/s0022-328x(00)87262-9
日期:1976.9
organometallic compounds such as allyl-zinc, -magnesium, -lithium and saturated lithium compounds are shown to readily undergo addition reactions with conjugated enynes: HCCC(R)C(R)(R), but the reactivity is reduced when the steric hindrance around the double bond is increased. With each organometallic compound used, this reaction is regioselective: 3,4 addition with organozinc compounds, 1,2 addition
Étude de la synthése, la structure et la réactivité d'un nouveau réactif organométallique résultant d'une réaction de dimérisation du bromure d'allyl-zinc
作者:Gilles Courtois、Leone Miginiac
DOI:10.1016/s0022-328x(00)95144-1
日期:1973.5
When heated for several hours in refluxing solvent, allylzinc bromide forms a new organometallic compound with a bis-1,3-organozinc structure. This compound reacts with different compounds leading in most cases to attachment of the structural group: