Silver-Catalyzed Atom-Economic Hydrophosphorylation of Propargyl Epoxides: An Access to 4-Phosphoryl 2,3-Allenols and Stereodefined 1-Phosphoryl 1,3-Dienes
作者:Ruwei Shen、Jianlin Yang、Ming Zhang、Li-Biao Han
DOI:10.1002/adsc.201700421
日期:2017.10.25
variety of P(O)H compounds including H‐phosphonates, H‐phosphinates and diarylphosphine oxides can be used to produce 4‐phosphoryl 2,3‐allenols under mild conditions. The stereoselective synthesis of 1‐phosphoryl 1,3‐butadienes from 4‐phosphoryl 2,3‐allenols and organoboronic acids via a palladium‐catalyzedcoupling reaction is also described.
Palladium Pincer Complex Catalyzed Stannyl and Silyl Transfer to Propargylic Substrates: Synthetic Scope and Mechanism
作者:Johan Kjellgren、Henrik Sundén、Kálmán J. Szabó
DOI:10.1021/ja043951b
日期:2005.2.1
corresponding pincer complex catalyst. DFT modeling studies have shown that the trimethylstannyl functionality is transferred to the propargylic substrate in a single reaction step with high allenyl selectivity. Inspection of the TS structures reveals that the trimethylstannyl group transfer is initiated by the attack of the palladium-tin sigma-bond electrons on the propargylic substrate. This is a novel
Cu-Catalyzed hydrophosphorylative ring opening of propargyl epoxides: highly selective access to 4-phosphoryl 2,3-allenols
作者:Ruwei Shen、Jianlin Yang、Haipeng Zhao、Yu Feng、Lixiong Zhang、Li-Biao Han
DOI:10.1039/c6cc05428e
日期:——
A novel CuI-catalyzed cross-couplings of propargyl epoxides with P(O)H compounds is disclosed. The reaction proceeded efficiently under mild conditions to give 4-phosphoryl 2,3-allenolderivatives in good to high yields with...
The synthesis of furans from acetylenic epoxides and diols
作者:D. Miller
DOI:10.1039/j39690000012
日期:——
Acetylenic αβ-epoxides react with dilute sulphuric acid and mercuric sulphate on heating to give furans in good yields; the reaction involves an internal hydration at a terminal acetylenic carbon atom. Under the influence of sulphuric acid alone, only small quantities of furans are formed; the major products are acetylenicdiols. These have been shown to be probable intermediates in the formation of
opening reaction of propargyl epoxides by amines based on a silver catalyst is presented. The reaction takes place under mild conditions and features a high regioselectivity to provide an effective method for the synthesis of 2-amino homopropargyl alcohols in moderate to high yields.