In Water and under Mild Conditions: α‐Alkylation of Ketones with Alcohols by Phase‐Transfer‐Assisted Borrowing Hydrogen Catalysis
作者:Lena Rakers、Felix Schäfers、Frank Glorius
DOI:10.1002/chem.201804308
日期:2018.10.17
produces water as the only by‐product. Nevertheless, harsh conditions such as high temperatures and organic solvents are usually required. Herein, we present a strategy to perform the α‐alkylation of ketones in aqueous media at mild temperatures by combining borrowing hydrogen with phase‐transfer catalysis. A broad scope of methyl ketones was functionalized with alkyl and benzyl alcohols in moderate
借用氢是一种有力且绿色的技术,可将现成的醇用作烷基化剂,并产生水作为唯一的副产物。然而,通常需要苛刻的条件,例如高温和有机溶剂。本文中,我们提出了一种策略,通过将借入氢与相转移催化相结合,在温和的温度下在水性介质中进行酮的α-烷基化反应。烷基和苯甲醇在40°C下以中等至良好的收率官能化了范围广泛的甲基酮。该协议在大规模和室温下也非常有效。