Direct Activation of Unmodified Morita–Baylis–Hillman Alcohols through Phosphine Catalysis for Rapid Construction of Three-Dimensional Heterocyclic Compounds
The phosphine-catalyzed tandem annulation reaction of Morita–Baylis–Hillman (MBH) alcohols with azomethine imines has been achieved for the synthesis of biologically important (epoxymethano)-pyrazolo[5,1-b]quinazoline derivatives. A variety of MBH alcohols and azomethine imines were well-tolerated under the mild reaction conditions, providing novel 3D heterocyclic compounds in high yields with excellent
Morita–Baylis–Hillman(MBH)醇与偶氮甲亚胺的膦催化串联环化反应已实现,用于合成生物学上重要的(环氧甲氧基)-吡唑并[5,1- b ]喹唑啉衍生物。在温和的反应条件下,多种MBH醇和甲亚胺亚胺具有良好的耐受性,从而以高收率提供了具有出色的非对映选择性的新型3D杂环化合物。这是首次实现了未改性的MBH醇作为新的氧杂合成子的直接活化。
Latent Nucleophiles in Lewis Base Catalyzed Enantioselective
<i>N</i>
‐Allylations of N‐Heterocycles
Latent nucleophiles are compounds that are themselves not nucleophilic but can produce a strong nucleophile when activated. Such nucleophiles can expand the scope of Lewis base catalyzed reactions. As a proof of concept, we report that N‐silyl pyrroles, indoles, and carbazoles serve as latent N‐centered nucleophiles in substitution reactions of allylic fluorides catalyzed by Lewis bases. The reactions
the directly dehydrative cross-coupling of allylicalcohols with terminal alkynes was developed. This calcium salt cocatalyst facilitates the oxidative addition of the palladium catalyst (1 mol %) to the C-OH bond. Then, the in situ-generated hydroxide ion deprotonates the terminal alkynes to promote the formation of the allylalkynylpalladium intermediate, liberating water as the only byproduct. This
1,1′-Carbonyldiimidazole mediates the synthesis of N-substituted imidazole derivatives from Morita–Baylis–Hillman adducts
作者:Manoel T. Rodrigues、Marilia S. Santos、Hugo Santos、Fernando Coelho
DOI:10.1016/j.tetlet.2013.10.146
日期:2014.1
straightforward method for the synthesis of N-substituted imidazole derivatives. 1,1-carbonyldiimidazole mediates the process, which requires no activation group step. We obtained imidazole derivatives in high yields and with short reaction times. To demonstrate the synthetic significance of the aforementioned compounds, we also describe the synthesis of novel ionic liquids from these derivatives.
A cascade synthesis of<i>S</i>-allyl benzoylcarbamothioates<i>via</i>Mumm-type rearrangement
作者:Anjali Dahiya、Wajid Ali、Tipu Alam、Bhisma K. Patel
DOI:10.1039/c8ob02293c
日期:——
A cascade synthesis ofS-allyl benzoylcarbamothioates has been achieved from Morita Baylis Hillman alcohols and aroyl isothiocyanatesviaMumm-type rearrangement.