Selective Catalytic Synthesis of Unsymmetrical Ethers from the Dehydrative Etherification of Two Different Alcohols
作者:Junghwa Kim、Dong-Hwan Lee、Nishantha Kalutharage、Chae S. Yi
DOI:10.1021/cs5012537
日期:2014.11.7
The cationic ruthenium–hydride complex [(C6H6)(PCy3)(CO)RuH]+BF4– catalyzes selective etherification of two different alcohols to form unsymmetrically substituted ethers. The catalytic method exhibits a broad substrate scope while tolerating a range of heteroatom functional groups in forming unsymmetrical ethers, and it is successfully used to directly synthesize a number of highly functionalized chiral
阳离子钌-氢化物配合物[(C 6 H ^ 6)(PCY 3)(CO)期RuH] + BF 4 -催化两个不同的醇的醚化的选择性,以形成不对称取代的醚。该催化方法在形成不对称醚时可容忍一定范围的杂原子官能团,因此具有广阔的底物范围,并且已成功用于直接合成许多高度官能化的手性非外消旋醚。
Development of a Storable Triazinone-Based Reagent for <i>O</i>-<i>p</i>-Methoxybenzylation under Mild Heating Conditions
A new triazinone-based reagent for O-p-methoxybenzylation has been developed. In spite of its stability in solid form, this reagent converts a free alcohol into the corresponding p-methoxybenzyl ether with mild heating (50–60 °C) in a solution. High functional group tolerance can be achieved because the reaction does not require the addition of an acidic or basic activator.
新三嗪酮为基础的试剂Ø - p -methoxybenzylation已经研制成功。尽管它以固体形式稳定,但在溶液中温和加热(50–60°C)时,该试剂可将游离醇转化为相应的对甲氧基苄基醚。可以实现高官能团耐受性,因为该反应不需要添加酸性或碱性活化剂。
Benzylation of hydroxy groups with tertiary amine as a base
作者:Jeremiah W. Gathirwa、Toshihide Maki
DOI:10.1016/j.tet.2011.10.016
日期:2012.1
The benzylation of hydroxy groups in the presence of tertiary amines is described. A mixture of an alcohol and a benzyl halide afforded the corresponding benzyl ether in good to excellent yields in the presence of diisopropylethylamine. The importance of solventless conditions was observed. The reaction showed high tolerance to many functional groups including benzoate, even at a reaction temperature
Synthesis of para-methoxybenzyl (PMB) ethers under neutral conditions
作者:Ernest O. Nwoye、Gregory B. Dudley
DOI:10.1039/b617926f
日期:——
2-(4-Methoxybenzyloxy)-4-methylquinoline reacts with methyl triflate in the presence of alcohols to generate a neutral organic salt that transfers the para-methoxybenzyl (PMB) protecting group onto alcohols in high yield and under mild conditions.
reaction of secondary and tertiary benzyl alcohols activated by 2,4,6-trichloro-1,3,5-triazine (TCT) with aldehydes in the presence of NiCl2·dmg as a precatalyst in ethylene glycol afforded ethers at roomtemperature. A selective C–O vs C–C bond formation was observed for the secondary and tertiary benzyl alcohols in comparison with primary ones.