An operationally simple protocol for the direct chlorination of 1,3-dicarbonyls (and related compounds such as α-cyano ketones) is described. The procedure relies on mild conditions using IBX–SO 3 K as the stoichiometric oxidizing agent and the ubiquitous sodium chloride. The presence of a phase-transfer catalyst is supportive to obtain good yields in a THF–water mixture.
描述了一种用于直接氯化 1,3-二羰基化合物(和相关化合物,如 α-氰基酮)的操作简单的协议。该过程依赖于使用 IBX-SO 3 K 作为化学计量氧化剂和无处不在的氯化钠的温和条件。相转移催化剂的存在有助于在 THF-水混合物中获得良好的产率。
IBX-Mediated Dehydrogenation of Substituted β-Oxonitriles
作者:Philipp Klahn、Stefan F. Kirsch
DOI:10.1002/ejoc.201402007
日期:2014.5
convenient method for the mild dehydrogenation of β-oxonitriles is presented. When treated with o-iodoxybenzoic acid (IBX), a range of these compounds were transformed into their unsaturated counterparts. Furthermore, we show that the products of the dehydrogenation can react in situ, undergoing rapid hetero-Diels–Alder reactions with enol ethers to give multiply substituted dihydropyrans. We also describe