Tunable Reaction Mode of Bifunctional Peroxides with Ketones to Access α-Oxacyclic Ketones and Enals
作者:Xiaolu Wen、Min Gao、Yiwei Chen、Yukun Zhao、Wenling Qin、Lin Hu
DOI:10.1021/acs.orglett.2c03440
日期:2022.11.18
A new annulation reaction between allylic/benzylic peroxides and ketones has been developed to provide the α-oxacyclic ketones in moderate yields under the KOtBu basic conditions. Mechanistic studies reveal that these peroxides undergo the Kornblum-DeLaMare rearrangement to release the aldehyde intermediates and subsequently initiate the aldol/etherification tandem process to deliver the final products
已经开发了一种新的烯丙基/苄基过氧化物和酮之间的环化反应,以在 KO t Bu 碱性条件下以中等产率提供 α-氧杂环酮。机理研究表明,这些过氧化物经过 Kornblum-DeLaMare 重排以释放醛中间体,随后启动醛醇/醚化串联过程以提供最终产品。因此,这些用作“掩蔽”烯醛的过氧化物也已被用于一步制备以前难以实现的α-烯醛系链酮。
Quest for diatomic selenium
作者:Andrzej Z. Rys、Erwin K.V. Schultz、David N. Harpp
DOI:10.1080/17415993.2010.513440
日期:2010.10.1
Metallocene pentaselenides and elemental selenium were employed in an effort to generate diatomic selenium (Se2) under thermal conditions. Trapping experiments were carried out with six dienes. A successful formation of a diselenium adduct was observed in the case of 5,6-dimethylene-cyclohexa-1,3-diene (1a). The other dienes produced the corresponding dihydroselenophenes. The in-depth study of the limitations of our method to generate Se2 is described; a plausible mechanism rationalizing the observed results is proposed.