Scalable Microwave-Assisted Johnson–Claisen Rearrangement with a Continuous Flow Microwave System
作者:Hiromichi Egami、Souma Tamaoki、Masato Abe、Noriyuki Ohneda、Takeo Yoshimura、Tadashi Okamoto、Hiromichi Odajima、Nobuyuki Mase、Kazuhiro Takeda、Yoshitaka Hamashima
DOI:10.1021/acs.oprd.8b00185
日期:2018.8.17
the rapid Johnson–Claisen rearrangement of allyl alcohol and triethyl orthoacetate with a continuous flow apparatus combined with a microwave reactor. The reaction could be carried out without solvent, and only a catalytic amount of acetic acid was sufficient to promote the reaction under microwave irradiation conditions. To confirm the optimal reaction conditions found experimentally, we performed Design
我们用连续流动装置结合微波反应器证明了烯丙醇和原乙酸三乙酯的约翰逊-克莱森快速重排。该反应可以在没有溶剂的情况下进行,并且仅催化量的乙酸足以在微波辐射条件下促进反应。为了确认实验中发现的最佳反应条件,我们通过Nelder–Mead方法和最小二乘法对乙酸的量和流速进行了实验设计(DoE)。因此,获得了所需的γ,δ-不饱和酯的最高收率,并且在最佳条件下,连续过程的反应步骤的生产率为89.5g / h,这表明理论上可以在室温下获得2.1kg的产物。 1天。