通过不同取代的2-氨基苯硫醇和2-溴-(2的一步反应,前所未有地形成11 H-苯并[5,6][1,4]噻嗪并[3,4- a ]异吲哚-11-酮已经研究了在回流条件下在新鲜干燥的乙醇中的((3-取代的苯基) -1H-茚-1,3( 2H )-二酮。这种独特的转化可能是通过最初的亲核取代、随后的开环和随后的分子内环化发生的。通过 FTIR、 1 H NMR、 13 C NMR、HRMS 和 X 射线晶体分析确定了所有合成的苯并[1,4]噻嗪异吲哚啉酮的结构。这种方法简单方便,具有原子经济性高、反应时间短和操作简单等优点。
quaternary stereocenter with high enantioselectivity and diastereoselectivity. Mechanistic studies and DFT calculations suggested that the rarely observed diastereoselectivity reversal is ascribed to the charge-charge interaction between the palladium and aromatic ring of the substrate, which could not only result in the reversal of the diastereoselectivity, but also improve the reactivity.
direct insertion of alkenes into unstrained ring 2-aryl-1,3-indandiones is reported, which provides a one-carbon ring expansion strategy for the synthesis of 1,4-naphthoquinones. Entirely differing from the existing reports, the alkenes herein behave as C1 units to participate in annulation reactions. This transformation provides a facile route to access a class of highly functionalized 1,4-naphthoquinones
An intermolecular annulation reaction of 2‐aryl‐1,3‐indandions with alkynes was reported using Pd(OAc)2 to access spirobi[indene]‐1,3‐diones. Under palladium catalysis, the substrates form a homocoupling dimer intermediate through a catalytic dehydrogenativecross‐coupling process. The palladium(II) species could come from dimer or 2‐aryl‐1,3‐indandion. Notably, this pathway is not typically observed
据报道,使用 Pd(OAc)2 进行 2-芳基-1,3-茚满二酮与炔烃的分子间成环反应,得到螺二[茚]-1,3-二酮。在钯催化下,底物通过催化脱氢交叉偶联过程形成同偶联二聚体中间体。钯 (II) 物质可能来自二聚体或 2-芳基-1,3-茚满二酮。值得注意的是,这种途径通常在烯醇导向的形式 sp3 C-H 官能化/氧化成环钯化学中观察不到。这种转化提供了获得一类官能化螺环碳环茚的途径。