β‐chloro aldimines with terminal alkynes leading to a rapid and efficient formation of 2‐alkynylazetidines in good to excellent yield has been described. The catalytic hydrogenation of the 2‐alkynylazetidines resulted in acyclic secondary amines by reductive cleavage of the 2‐alkynylazetidine. Further, these non‐activated 2‐alkynylazetidines were ring expanded in a reaction with dimethyl acetylenedicarboxylate
activation of secondaryamides in the presence of alkynes. An unusual mechanistic detour leading to pyridine derivatives as products is also presented and briefly discussed. In this article we describe the straightforward synthesis of polysubstituted pyrimidines by electrophilic activation of secondaryamides in the presence of alkynes. An unusual mechanistic detour leading to pyridine derivatives as products
A novel palladium-catalyzed domino cyclization/alkylation of terminal alkynes was achieved for the synthesis of alkynyl-functionalized 3,3-disubstituted azaindoline derivatives under air atmosphere conditions. Various types of terminal alkynes, including aromatic alkynes, aliphatic alkynes, and ferrocene acetylene, can undergo the process successfully. The protocol provides a range of alkynyl-functionalized
Alkali metal salts-assisted coupling reaction between fluorinated benzyl electrophiles and alkenylboronic acids
作者:Wenna Xie、Shiwen Liu、Gerald B. Hammond、Bo Xu
DOI:10.1039/d2nj04156a
日期:——
We have developed a versatile transition metal-free cross-coupling reaction between fluorinated benzyl electrophiles and alkenylboronic acids in the presence of the equivalent amount of alkalimetal salts such as K3PO4. This transition metal-free protocol gives good chemical yields for a wide range of substrates and demonstrates good functional group tolerance.
在等量的碱金属盐(如 K 3 PO 4 )存在下,我们开发了一种通用的无过渡金属的氟化苄基亲电试剂和烯基硼酸之间的交叉偶联反应。这种无过渡金属的协议为各种底物提供了良好的化学产量,并表现出良好的官能团耐受性。
Direct Access to α<i>,</i>β-Alkynylamides via Pd-Catalyzed Carbonylation of Terminal Alkynes with Amines Using Chloroform as the CO Surrogate
作者:Gajanan K. Rathod、Rahul Jain
DOI:10.1021/acs.joc.3c00460
日期:2023.6.2
catalytic system for the synthesis of alk-2-ynamides from terminal alkynes via aminocarbonylation reaction. This method avoids the direct use of toxic CO gas by utilizing chloroform as an in situ CO source. The aminocarbonylation of both aromatic and aliphatic electron-rich alkyne nucleophiles is reported for the first time. The mild condition provides alk-2-ynamides within 50 min undermicrowave irradiation
我们描述了首次使用钯-二(1-金刚烷基)-正丁基膦催化系统通过氨基羰基化反应从末端炔烃合成 alk-2-ynamides。该方法通过利用氯仿作为原位 CO 源,避免了直接使用有毒 CO 气体。首次报道了芳香族和脂肪族富电子炔烃亲核试剂的氨基羰基化。在 80 °C 的微波照射下,温和的条件可在 50 分钟内提供 alk-2-ynamides。