Propylene Glycol Cyclic Sulfate as a Substitute for Propylene Oxide in Reactions with Acetylides
作者:Roderick W. Bates、Tushar B. Maiti
DOI:10.1081/scc-120015819
日期:2003.1.4
Abstract Lithium acetylides react cleanly with propylene glycol cyclicsulfate to give, after acidic hydrolysis, homopropargylic alcohols in good yield. The benzyl and TBDPS protecting groups are stable to these conditions, but the THP, TBS, acetal and orthoester groups are not. The readily available (S)-cyclic sulfate gives the (S)-alcohol without loss of stereochemical integrity.
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
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.