Alkynylation/dearomatizative cyclization to construct spiro[5.5]undecanes
作者:Jidong Shao、Liqi Li、Jie Zhang、Jingping Hu、Jijun Xue、Ying Li
DOI:10.1039/c6ra02463g
日期:——
A new access to spiro[5.5]undecane frameworks was reported through the ZnMe2-promoted alkynylation of salicylaldehyde and HCO2H-mediated dearomatizative cyclization which can be used to construct an all-carbon quaternary spirocenter. This method can be applied to the rapid synthesis towards a series of useful motifs of natural products, such as the core of elatol and aphidicolin.
Synthesis of Sulfonylated Heterocycles via Copper‐Catalyzed Heteroaromatization/Sulfonyl Transfer of Propargylic Alcohols
作者:Xinyi Chen、Andrey Shatskiy、Jian‐Quan Liu、Markus D. Kärkäs、Xiang‐Shan Wang
DOI:10.1002/asia.202001126
日期:2021.1.4
An unprecedented copper‐catalyzed heteroaromatization/sulfonyl transfer of propargylicalcohols with isocyanide has been developed. 3‐Sulfonyl benzofurans and indoles were produced under Cu(I) catalysis in good to high yields. The developed catalytic methodology provides controlled, modular, and facile access to sulfonyl benzoheterocycle scaffolds.
Cu(OAc)<sub>2</sub>·H<sub>2</sub>O-Promoted Tandem β-Alkynyl Elimination of α- or β-Hydroxy Propargylic Alcohols and Homocoupling of the Resulting Alkynyl Species
作者:Xiangsheng Xu、Zhenyong Huang、Yanfeng Lu
DOI:10.3184/174751913x13739011239995
日期:2013.9
α or β-hydroxy propargylic alcohols undergo tandem C(sp)–C(sp3) bondcleavage via β-alkynyl elimination and homo-coupling of the resulted alkynyl species in the presence of Cu(OAc)2·H2O to produce the corresponding hydroxycarbonyl compounds and 1,3-butadiynes.
Microwave-Assisted Generation and Capture by Azoles of<i>ortho</i>-Quinone Methide Intermediates under Aqueous Conditions
作者:Silvia González-Pelayo、Luis A. López
DOI:10.1002/ejoc.201701183
日期:2017.11.2
ortho-Quinone methides can be efficiently generated in water. Trapping with azoles provides a convenient route to alkylated azole derivatives, a class of heterocyclic compounds with potential applications in medicinal chemistry. This protocol does not require any activator for the generation of the reactiveintermediate. No chromatographic purification is required in most cases.
Regioselective synthesis of flavone derivatives via DMAP-catalyzed cyclization of o-alkynoylphenols
作者:Masahito Yoshida、Yuta Fujino、Koya Saito、Takayuki Doi
DOI:10.1016/j.tet.2011.09.063
日期:2011.12
A catalytic amount of DMAP promoted cyclization of o-alkynoylphenols via a 6-endo cyclization mode leading to flavone derivatives in high yields without forming 5-exo cyclizedauronederivatives. Utilizing this method, methoxy substituted flavone and alkyl substituted γ-benzopyranone derivatives were synthesized.