Diastereoselectivity in heterogeneous catalytic hydrogenation of Baylis–Hillman adducts. Total synthesis of (±)-sitophilate
摘要:
We describe herein a highly diastereoselective total synthesis of racemic sitophilate, based on the results obtained in a diastereoselective heterogeneous catalytic hydrogenation reaction of a set of Baylis-Hillman adducts originating from aliphatic aldehydes. (C) 2001 Published by Elsevier Science Ltd.
Palladium-catalyzed carbonyl allylation by 2-(hydroxymethyl)acrylate derivatives: synthesis of α-methylene-γ-butyrolactones
作者:Yoshiro Masuyama、Yumiko Nimura、Yasuhiko Kurusu
DOI:10.1016/0040-4039(91)80861-y
日期:1991.1
Ethyl 2-(Hydroxymethyl)acrylate derivatives serve as reagents for 2-ethoxycarbonylallylation of carbonyl compounds usingPdCl2(PhCN)2-SnCl2system to produce α-methylene-γ-butyrolactones diastereoselectivity.
Various phenyl and p‐tolyl allyl sulfonederivatives were prepared stereoselectively by reacting BaylisHillman acetates with sodium 4‐R‐benzenesulfinate (R=H, Me) in H2O. The reaction was very efficient in providing the corresponding sulfonederivatives in good to excellent yields (Table).
Ultrasound in Baylis–Hillman reactions with aliphatic and aromatic aldehydes: scope and limitations
作者:Fernando Coelho、Wanda P. Almeida、Demetrius Veronese、Cristiano R. Mateus、Elizandra C. Silva Lopes、Rodrigo C. Rossi、Gabriel P.C. Silveira、César H. Pavam
DOI:10.1016/s0040-4020(02)00822-0
日期:2002.9
The utilization of ultrasound radiation in the Baylis–Hillman reaction with several aldehydes (aromatics and aliphatics) and different α,β-unsaturated reactants is described. For all aldehydes tested, the utilization of ultrasound sources augmented the reactionrate and the chemical yields. The use of ultrasound with two different catalysts (tri-n-butylphosphine and 1,4-diazabicyclo[2.2.2]octane [DABCO])
On the tandem Morita-Baylis-Hillman/transesterification processes. Mechanistic insights for the role of protic solvents
作者:Arthur G. Carpanez、Fernando Coelho、Giovanni W. Amarante
DOI:10.1016/j.molstruc.2017.10.039
日期:2018.2
Abstract Despite the remarkable rate acceleration under proticsolvents such as alcohols and water, the use of acrylates as activated alkenes places a problem due to the possibility of ester hydrolysis or transesterification. Therefore, the tandem transesterification/Morita-Baylis-Hillman (MBH) reactions were investigated by ESI(+)-MS/(MS) and 1 H NMR techniques. For the first time, the MBH back-reaction
Pd(0)-catalyzed couplings using bromide and chloride derivatives of Baylis–Hillman adducts with triarylbismuths as atom-efficient multi-coupling nucleophiles
作者:Maddali L.N. Rao、Debasis Banerjee、Ritesh J. Dhanorkar
DOI:10.1016/j.tet.2010.03.020
日期:2010.5
triarylbismuths affording allylic arylated products in high yields under palladium-catalyzed conditions. Triarylbismuths have been employed in sub-stoichiometric amounts as multi-coupling and atom-efficient nucleophiles in these reactions. The reactivity of both allylic bromides and chlorides was found to be facile and equally efficient in couplings with triarylbismuths.