作者:Tomohiro Yasukawa、Hanako Nakajima、Ryusuke Masuda、Yasuhiro Yamashita、Shu̅ Kobayashi
DOI:10.1021/acs.joc.2c01411
日期:2022.11.4
Although the use of molecular sieves for imine synthesis is a common protocol, there have been no comprehensive studies on heat-drying methods. This can be crucial for reproducibility. It was found that molecular sieve 5A dried at 160 °C for 5 h under vacuum efficiently promoted the condensation of various ketones and amines to afford even relatively bulky ketimines. Several control experiments and
虽然使用分子筛合成亚胺是一种常见的方案,但尚未对加热干燥方法进行全面研究。这对于重现性至关重要。发现分子筛 5A 在 160°C 真空干燥 5 小时有效地促进了各种酮和胺的缩合,甚至得到相对庞大的酮亚胺。几个对照实验和分析表明,只有少量的布朗斯台德酸位点对活性很重要,而不是脱水能力。在用水处理然后加热干燥后,可以使用其他类型的分子筛进行反应。还展示了使用活化分子筛 5A 的醇的连续流动缩醛化反应。