DBU-Catalyzed Rearrangement of Secondary Propargylic Alcohols: An Efficient and Cost-Effective Route to Chalcone Derivatives
作者:Mrinal K. Bera、Rimpa De、Antony Savarimuthu、Tamal Ballav、Pijush Singh、Jayanta Nanda、Avantika Hasija、Deepak Chopra
DOI:10.1055/s-0040-1707909
日期:2020.10
A 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-catalyzed rearrangement of diarylated secondarypropargylic alcohols to give α,β-unsaturated carbonyl compounds has been developed. The typical 1,3-transposition of oxy functionality, characteristic of Mayer–Schuster rearrangements, is not observed in this case. A broad substrate scope, functional-group tolerance, operational simplicity, complete atom economy
Siloxyallenes revisited. A useful functional intermediate for the synthesis of (Z)-β-branched Morita–Baylis–Hillman type adducts and (Z)-chalcones
作者:Kazuhiro Yoshizawa、Takayuki Shioiri
DOI:10.1016/j.tet.2007.02.025
日期:2007.7
Siloxyallenes proved to be a usefulfunctionalintermediate in the preparation of (Z)-β-branched Morita–Baylis–Hillman type adducts by the reaction of aldehydes with silylacetylenes or siloxypropynes. Various (Z)-chalcones were stereoselectively synthesized from siloxypropynes via siloxyallenes.
Synthesis of tetrahydro-β-carbolines from 2-indolylmethyl azides and propargylic alcohols
作者:Haiting Yin、Qin Ma、Yushan Wang、Xiaoxia Gu、Zhijun Feng、Yunjun Wu、Ming Wang、Shaoyin Wang
DOI:10.1039/d1ra03022a
日期:——
A facile and efficient route to tetrahydro-β-carbolines from 2-indolylmethyl azides and propargylic alcohols via acid-catalyzed dehydrative annulation reactions is described. This reaction proceeds through a cascade sequence of Friedel–Crafts-type alkylation followed by intramolecular “Click” reaction, involving the formation of multiple chemical bonds in a single operation with excellent atom-economy
AgSbF6-catalyzed efficient propargylation/cycloisomerization tandem reaction for the synthesis of fully substituted furans and new insights into the reaction mechanism
作者:Satheesh Gujarathi、Guangrong Zheng
DOI:10.1016/j.tet.2015.06.090
日期:2015.9
efficient AgSbF6 mediated one-pot propargylation/cycloisomerization tandem process has been developed for the construction of fully substitutedfurans through the reaction of propargylic alcohols and 1,3-dicarbonyl compounds. The isolation of a key reaction intermediate provided new insights into the reaction mechanism.