CeCl3-mediated addition of acetylenic bis-lithium salts to aldehydes and ketones: An efficient route to bis-substituted alkyne diols
作者:Jefferson Luiz Princival、Jeiely Gomes Ferreira
DOI:10.1016/j.tetlet.2017.07.094
日期:2017.9
An efficient, chemoselective protocol to access propargylic diols via a CeCl3-mediated addition reaction is reported. Propargylic alcohols were transformed into the corresponding acetylenic bis-lithium salt intermediates, which react with aldehydes and ketones in the presence of dry CeCl3 to furnish the corresponding bis-substituted alkyne diols. This protocol does not involve protection-deprotection
Hydrogenation Promoter, Hydrogenation Catalyst, and Process for Producing Alkene Compound
申请人:Hori Junichi
公开号:US20080033221A1
公开(公告)日:2008-02-07
A hydrogenation promoter of the present invention is produced by reacting an alkyne compound or an alkene compound, a palladium compound represented by a general formula Pd(II)X
j
L
k
(where L represents a monodentate ligand or a polydendate ligand other than a phosphorus-containing ligand (when two or more Ls are present in the compound, the Ls may be the same or different), X represents an anionic group, j represents a value determined according to the valence of X so that X
j
has a valence of −2 as a whole, and k represents an integer in the range of 0 to 4), and a base in an organic solvent. Specifically, The hydrogenation promoter of the invention includes palladium nanoparticles containing the alkyne compound or the alkene compound as an agglomeration-preventing agent.
Synthesis and in vitro evaluation of ( R ), ( S ) and ( R / S )-2-hexyne-1,4-diol, a natural product produced by fungus Clitocybe catinus , and related analogs as potential anticancer agents
作者:Iza Mirela R.G. Princival、Jeiely G. Ferreira、Teresinha G. Silva、Jaciana S. Aguiar、Jefferson L. Princival
DOI:10.1016/j.bmcl.2016.04.060
日期:2016.6
for natural products and related analogs as potential anticancer agents has seen a significant growth worldwide. Since small sized propargylic diols can be found in nature and chemically synthesized, their evaluation against cancer cells has been of great interest, being a topic of relevance to be investigated. For this purpose, a scalable approach aiming at the synthesis of several propargylic diols
Enzymatic kinetic resolution of internal propargylic diols. Part I: a new approach for the synthesis of (S)-pent-2-yn-1,4-diol, a natural product from Clitocybe catinus
作者:Jeiely G. Ferreira、Cleverson R. Princival、Dyego M. Oliveira、Renata X. Nascimento、Jefferson L. Princival
DOI:10.1039/c5ob00386e
日期:——
Employing a two round sequence EKR, mono- and bis-acetoxy propargylic products were obtained in a high enantiomeric ratio (E > 200). The efficiently resolved chiral 8b was applied in a concise synthesis of (S)-1b, an optically active natural product produced by fungi Clitocybe catinus.