Rhodium(II)-Catalyzed Reaction of 1-Tosyl-1,2,3-triazoles with Morita-Baylis-Hillman Adducts: Synthesis of 3,4-Fused Pyrroles
作者:Renmeng Jia、Jiang Meng、Jiaying Leng、Xingxin Yu、Wei-Ping Deng
DOI:10.1002/asia.201800057
日期:2018.9.4
A cascade reaction of rhodium azavinylcarbenes with Morita–Baylis–Hillman (MBH) adducts enables a novel synthetic approach to 3,4‐fused pyrroles. The cascade reaction begins with the insertion of O−H bond into rhodium azavinylcarbenes, subsquent sigmatropic rearrangement provides substituted α,β‐unsaturated cyclic ketone intermediates. Then the intramolecular aza Michael addition/oxidative aromatization
Switching the Reactivity of Dihydrothiopyran-4-one with Aldehydes by Aqueous Organocatalysis: Baylis–Hillman, Aldol, or Aldol Condensation Reactions
作者:M. Saeed Abaee、Mohammad M. Mojtahedi、Ghasem F. Pasha、Elahe Akbarzadeh、Abbas Shockravi、A. Wahid Mesbah、Werner Massa
DOI:10.1021/ol202145w
日期:2011.10.7
An aqueous medium containing catalytic amounts of a tertiary amine was employed to direct the chemoselectivity of the reaction of aldehydes with 1a. With DBU, 2 was formed at room temperature as a rare exemplary of Baylis–Hillman reactions in heterocyclic enones. DABCO alternated the pathway toward an aldol reaction to form syn/anti mixtures of 3 with the syn isomers being the major products. With
Protein self-assembly induces promiscuous nucleophilic biocatalysis in Morita–Baylis–Hillman (MBH) reaction
作者:Pralhad N. Joshi、Landa Purushottam、Nirmal K. Das、Saptarshi Mukherjee、Vishal Rai
DOI:10.1039/c5ra23949d
日期:——
Self-assembled states of proteins render efficient promiscuous nucleophilic biocatalysis in MBH reaction in a green process.
蛋白质的自组装状态在MBH反应中实现了高效的杂多亲核生物催化作用,这是一种绿色过程。
Iron(III) chloride-catalysed direct nucleophilic α-substitution of Morita-Baylis-Hillman alcohols with alcohols, arenes, 1,3-dicarbonyl compounds, and thiols
作者:Xiaoxiang Zhang、Weidong Rao、Sally、Philip Wai Hong Chan
DOI:10.1039/b908447a
日期:——
A general and efficient direct method for the α-substitution of Morita-Baylis-Hillman alcohols with carbon- and heteroatom-centred nucleophiles such as alcohols, arenes, 1,3-dicarbonyl compounds, and thiols in the presence of FeCl3·6H2O as catalyst has been developed. The reaction is operationally straightforward, accomplished in good to excellent product yields (40â99%) and with exclusive α-regioselectivity under mild conditions that did not need an inert and moisture-free environment.
A highly α-regioselective In(OTf)3-catalyzed N-nucleophilic substitution of cyclic Baylis–Hillman adducts with aromatic amines
作者:Yu-Liang Liu、Li Liu、Dong Wang、Yong-Jun Chen
DOI:10.1016/j.tet.2009.02.048
日期:2009.4
The highly α-regioselective N-nucleophilic substitution of B–H adducts bearing five (1a–f) or six-membered ring (5a–e) moieties with aromatic amines (2a–e) was developed under the catalysis of In(OTf)3 (10 mol%). During the reaction the allylic rearrangement from γ-product to α-product occurred, resulting in thermodynamically stable α-product predominately.