Base-catalyzed diastereodivergent thia-Michael addition to chiral β-trifluoromethyl-α,β-unsaturated <i>N</i>-acylated oxazolidin-2-ones
作者:Sasirome Racochote、Phiphob Naweephattana、Panida Surawatanawong、Chutima Kuhakarn、Pawaret Leowanawat、Vichai Reutrakul、Darunee Soorukram
DOI:10.1039/d3ob00999h
日期:——
DABCO, or P2-t-Bu), a range of chiral thia-Michael adducts was synthesized in good yields with high diastereoselectivities. A plausible mechanism was proposed on the basis of the experimental results. This work is complementary to the existing methods offering advantages, e.g., switchable diastereoselectivity using a readily synthesized chiral starting material, a cheap and readily available base catalyst
报道了硫醇与手性 β-三氟甲基-α,β-不饱和N-酰化恶唑烷-2-酮的碱催化非对映发散硫杂-迈克尔加成反应。通过调整碱催化剂(i -Pr 2 NEt、DABCO 或 P 2 - t -Bu),以良好的收率和高非对映选择性合成了一系列手性硫杂-迈克尔加合物。根据实验结果提出了一种合理的机制。这项工作是对现有方法的补充,提供了一些优点,例如,使用易于合成的手性起始材料、廉价且易于获得的碱催化剂、以及简单实用的操作来实现可切换的非对映选择性,使得能够在有机合成中进行合成应用。