Reaction of 2-Alkynylbenzoyl
Cyanides with Carboxylic Acids Producing Functionalized Indenones
作者:Masahiro Murakami、Hiroshi Shimizu
DOI:10.1055/s-2008-1078501
日期:——
2-Alkynylbenzoyl cyanides react with carboxylic acidsvia a cyclicallene intermediate to produce 2-acylamino-3-acylindenones in good yield. The high reactivity of the 2-acylamino moiety of the product for a substitution reaction can be utilized for the synthesis of fused heterocycles.
Intramolecular Carboxyamidation of Alkyne‐Tethered <i>O</i>‐Acylhydroxamates through Formation of Fe(III)‐Nitrenoids
作者:Siyuan Su、Yu Zhang、Peng Liu、Donald J. Wink、Daesung Lee
DOI:10.1002/chem.202303428
日期:2024.1.26
induced spontaneous or 4-(dimethylamino)pyridine-catalyzed O→O or O→N acyl group migration can generate a wide variety of N,O-containing heterocycles. DFT study suggests the Fe-nitrenoid intermediate preferentially reacts in a radical manifold to mediates a stepwise C−N/C−O bond formation rather than a concerted [3+2] cycloaddition mechanism.
Zip and shift : 炔烃束缚的O-酰基异羟肟酸酯的分子内羧酰胺化,然后是热诱导自发或4-(二甲氨基)吡啶催化的O→O或O→N酰基迁移,可以生成多种含N 、 O的杂环。 DFT 研究表明,Fe-氮烯类中间体优先在自由基流形中反应,介导逐步的 C−N/C−O 键形成,而不是协调一致的 [3+2] 环加成机制。
An efficient stereospecific preparation of (Z)-3-methylidene-selenophthalides and (z)-3-methylidenetellurophthalides
作者:Haruki Sashida、Atsusbi Kawamukai
DOI:10.1002/jhet.5570350131
日期:1998.1
(Z)-3-Methylideneselenophthalides 5A and (Z)-3-methylidenetellurophthalides 5B were easily prepared by the regioselective and stereoselective reaction of 2-ethynylbenzoyl chlorides 3 with sodium hydroselenide and sodium hydrotelluride in good yields, respectively.