KOAc-promoted alkynylation of α-C–H bonds of ethers with alkynyl bromides under transition-metal-free conditions
作者:Jiajun Zhang、Pinhua Li、Lei Wang
DOI:10.1039/c4ob00002a
日期:——
KOAc-promoted α-position C–H activation and alkynylation of ethers with alkynyl bromides to 2-alkynyl ethers was developed under transition-metal-free conditions.
A metal-free direct alkylation of CâH bonds adjacent to an oxygen or nitrogen atom was developed. This reaction occurred between saturated heterocycles and ethynylbenziodoxolones under mild conditions. A series of 2-alkynyl cyclic alkanes that contain oxygen or nitrogen atoms were prepared in moderate to good yields.
Visible‐Light‐Induced Alkynylation of α‐C–H Bonds of Ethers with Alkynyl Bromides without External Photocatalyst
作者:Xiaofei Xie、Jie Liu、Lei Wang、Min Wang
DOI:10.1002/ejoc.201900872
日期:2020.3.15
An unprecedented direct alkynylation reaction of α‐C(sp3)–H bonds of ethers under visiblelight irradiation at room temperature withoutexternalphotocatalyst was developed.
Accessing alternative reaction pathways of the intermolecular condensation between homo-propargyl alcohols and terminal alkynes through divergent gold catalysis
作者:Courtney A. Smith、Stephen E. Motika、Lukasz Wojtas、Xiaodong Shi
DOI:10.1039/c6cc09794d
日期:——
An intermolecular condensation of alkynols and terminal alkynes is reported. Using IPrAuNTf2, an efficient Au-catalyzed cyclization-alkynylation strategy furnishes (2-arylalkynyl) cyclic ethers in moderate to excellent yields (up to 94%). This...
据报道,炔醇和末端炔烃发生分子间缩合。使用 IPrAuNTf2,一种有效的 Au 催化环化-炔基化策略可以以中等至优异的产率(高达 94%)提供(2-芳基炔基)环醚。这...
Functionalisation of ethereal-based saturated heterocycles with concomitant aerobic C–H activation and C–C bond formation
作者:Nehaal Ahmed、Richard J. Spears、Tom D. Sheppard、Vijay Chudasama
DOI:10.1039/d2sc01626e
日期:——
emphasis on sustainable synthesis, aerobic C–Hactivation (the use of oxygen in air to activateC–H bonds) represents a highly attractive conduit for the development of novel synthetic methodologies. Herein, we report the air mediated functionalisation of various saturated heterocycles and ethers via aerobically generated radical intermediates to form new C–C bonds using acetylenic and vinyl triflones as radical