A concise synthesis of rooperol and related 1,5-diarylpent-1-en-4-ynes
摘要:
Two powerful strategies: rapid construction of allylic alkynoates via cyclopropenium ion chemistry and mild, palladium-catalyzed decarboxylative coupling were employed in a concise, 5-steps synthesis of the natural product rooperol. The overall approach allows the preparation of rooperol analogs in as few as 3 steps. (C) 2013 Elsevier Ltd. All rights reserved.
Highly Efficient and Convenient Methods for the Direct Conversion of Aryl Silyl Ethers and Aryl Acetates into Aryl Alkyl Ethers
作者:Takeshi Oriyama、Kojiro Noda、Kaori Yatabe
DOI:10.1055/s-1997-3267
日期:1997.6
Direct conversion of aryl trialkylsilyl ethers and aryl acetates into the corresponding alkyl-protected phenols such as benzyl and allyl ethers can be conveniently performed by the reaction with alkyl halide in the presence of cesium fluoride and sodium methoxide, respectively, in a one-pot procedure.
Highly Active Multidentate Catalysts for Efficient Alkyne Metathesis
申请人:THE REGENTS OF THE UNIVERSITY OF COLORADO, A BODY CORPORATE
公开号:US20130261295A1
公开(公告)日:2013-10-03
The invention relates to highly active and selective catalysts for alkyne metathesis. In one aspect, the invention includes a multidentate organic ligand wherein one substrate-binding site of the metal center is blocked. In another aspect, the invention includes N-quaternized or silane-based multidentate organic ligands, capable of binding to metals. In yet another aspect, the invention includes N-quaternized or silane-based multidentate catalysts. The catalysts of the invention show high robustness, strong resistance to small alkyne polymerization and significantly enhanced catalytic activity compared to their corresponding non-quaternized or non-silane-based multidentate catalyst analogues.
propylidyne catalysts has been developed, which are resistant to small alkyne polymerization and compatible with various functional groups (including phenol substrates). The catalysts remain active in solution for days at room temperature (months at −30 °C). The catalysts are also compatible with 5 Å molecular sieves (small alkyne scavengers), and have enabled the homodimerization of small alkyne substrates
coordination in the basepairing, thereby creating a novel hybridization motif in duplex DNA. In this regard, we have further designed two types of artificial beta-C-nucleosides possessing a metal-chelating site (a 2-aminophenol or a catechol) as the nucleobase moiety. These artificial nucleosides are directed toward controlling the net charges of the metal-assisted basepairs. This paper describes
An Effective Approach for the Silylation of Hydroxyl Compounds in Room Temperature Ionic Liquids
作者:Zhen-Yuan Xu、Dan-Qian Xu、Bao-You Liu、Shu-Ping Luo
DOI:10.1081/scc-120026356
日期:2003.12.1
The room temperature ionic liquid (RTIL) 1-n-butyl-3-methylimidazolium hexafluorophosphate (BMImPF(6)) is used as a "green" recyclable. alternative to conventional solvents for the silylation of a series of hydroxyl compounds (alcohols and phenols) with t-butyidimethylchlorosilane (TBDMCS), which has some advantages such as simplicity of the synthetic procedure, the potential for recycling of the ionic liquid and the environmentally benign.