Silver(I)-Catalyzed Novel Cascade Cyclization Reactions: Incorporation of Allenes into the Isochromenes
作者:Nitin T. Patil、Nirmal K. Pahadi、Yoshinori Yamamoto
DOI:10.1021/jo051524q
日期:2005.11.1
The silver(I)-catalyzed reaction of alkynones with alcohols represents a general tool for the synthesis of 1-allenyl isochromenes. The reaction most probably proceeds via the formation of benzopyrylium cation, which subsequently undergoes nucleophilic attack of an alcohol to give the annulation products.
A series of neglected 1‐aminoisochromenes have been prepared under mild condition by a selective dominoreaction between 2‐alkynylbenzaldehydes and electron‐poor anilines catalyzed by original silver(I) complexes characterized by the presence of a pyridine containing macrocyclic ligand [AgIPcL].
在温和的条件下,通过以原始的银(I)配合物为特征的2-炔基苯甲醛与贫电子苯胺之间的选择性多米诺反应,制备了一系列被忽略的1-氨基异色酮,其特征在于存在含吡啶环的大环配体[Ag I PcL] 。
Synthesis of Thioacetal <i>via</i> AgOTf-catalyzed Reaction of 2-Alkynylbenzaldehyde with Thiol
An efficient and mild method for thioacetalization of 2-alkynylbenzaldehydes in the
presence of a catalytic amount of silver triflate has been described. This reaction proceeded efficiently
to generate 2-alkynylbenzaldehydes thioacetals in good to excellent yields at room temperature within
short reaction time (no more than 30 min). This transformation was extremely easy to perform without
the need of using anhydrous solvent and inert atmosphere. Chemoselective thioacetalization of benzaldehyde in the presence
of acetophenone was also demonstrated.
Tunable Synthesis of Indeno[1,2-<i>c</i>]furans and 3-Benzoylindenones via FeCl<sub>3</sub>-Catalyzed Carbene/Alkyne Metathesis Reaction of <i>o</i>-Alkynylbenzoyl Diazoacetates
作者:Bin Li、Nana Shen、Yujie Yang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.0c03882
日期:2021.1.15
An efficient synthesis of indeno[1,2-c]furan and 3-benzoylindenone derivatives through a FeCl3-catalyzed carbene/alkyne metathesis reaction of o-alkynylbenzoyl diazoacetates is presented. Mechanistically, the key intermediate, vinyl iron carbene, is formed by 5-exo-dig carbocyclization and terminated with a formal [3 + 2] cycloaddition or carbonylation. To the best of our knowledge, this is the first
提出了一种通过FeCl 3催化邻炔基苯甲酰基重氮乙酸酯的卡宾/炔烃复分解反应有效合成茚并[1,2- c ]呋喃和3-苯并亚吲哚酮衍生物的方法。从机理上讲,关键中间体乙烯基铁卡宾通过5 -exo-dig碳环化反应形成,并以正式的[3 + 2]环加成或羰基化作用终止。据我们所知,这是第一个将FeCl 3用作卡宾/炔烃复分解反应的催化剂的例子。最后,进行衍生化反应以展示产品的价值。
Silver-Catalysed Domino Approach to 1,3-Dicarbo-Substituted Isochromenes
triflate-catalyzed synthesis of 1,3-dicarbosubstituted isochromene derivatives starting from 2-alkynyl(hetero)arylaldehydes and enolizable ketones. The reaction proceeds in a cascade fashion under mild heating with complete regioselectivity. The reaction yields range from moderate to good. In some cases, the reaction gives unexpected homodimeric products. Two competitive mechanistic paths for the formation of the