Cobalt‐Catalyzed Transfer Hydrogenation of α‐Ketoesters and
<i>N</i>
‐Cyclicsulfonylimides Using H
<sub>2</sub>
O as Hydrogen Source
作者:Yang Gao、Xuexin Zhang、Ronibala Devi Laishram、Jingchao Chen、Kangkui Li、Keyang Zhang、Guangzhi Zeng、Baomin Fan
DOI:10.1002/adsc.201900636
日期:2019.9.3
A Co‐catalyzed effective transferhydrogenation of various α‐ketoesters and N‐cyclicsulfonylimides by safe and environmentally benign H2O as hydrogensource is described. The reaction used easily available and easy to handle zinc metal as a reductant. Interestingly, the catalytic system does not require ligand for reduction of N‐cyclicsulfonylimides.
RhIII-catalyzed aryl C–H vinylation for the preparation of styrenes by using vinylacetate, a commercially available and inexpensive compound, as the vinyl source was successfully realized. This method enables various aromatics including N-sulfonyl ketimines, pyridines, azoles, and amides to be vinylated in moderate to good yields.
Iridium-Catalyzed Annulation of Aromatic Imines with 1,3-Dienes<i>via</i>Direct Functionalization of an Aromatic CH Bond
作者:Yusuke Ebe、Miyuki Hatano、Takahiro Nishimura
DOI:10.1002/adsc.201401171
日期:2015.5.4
to give 1‐aminoindane derivatives in high yields with high regio‐ and stereoselectivities. The iridium complex coordinated with a substrate 1,3‐diene displayed high catalyticactivity. The reaction proceeds via the direct formation of the aryliridium(I) species from the aromatic aldimine and an iridium(I) acetate species via a concerted metalation‐deprotonation pathway.
Rhodium-catalysed direct C–H allylation of N-sulfonyl ketimines with allyl carbonates
作者:Shu-Tao Mei、Nan-Jin Wang、Qin Ouyang、Ye Wei
DOI:10.1039/c4cc09899d
日期:——
Synthetically useful N-sulfonyl ketimines were efficiently allylated with various allyl carbonates through rhodium catalysis.
合成上有用的N-磺酰基酮亚胺可通过铑催化与各种烯丙基碳酸酯有效地发生烯丙基化反应。
Ir(III)/MPAA-Catalyzed Mild and Selective C–H Amidation of <i>N</i>-Sulfonyl Ketimines: Access To Benzosultam-Fused Quinazolines/Quinazolinones
作者:Aniket Mishra、Upasana Mukherjee、Tripta Kumari Vats、Indubhusan Deb
DOI:10.1021/acs.joc.8b00125
日期:2018.4.6
unprecedented mild C–H amidation for weakly coordinating cyclic N-sulfonyl ketimines, accelerated by a mono protected l-amino acid, has been developed. The method uses 1,4,2-dioxazol-5-ones as the robust amidating reagent in conjunction with a catalytic amount of silver triflate. It is highlyselective and does not require a stoichiometric amount of oxidants or additives. A series of mechanistic experiments
已经开发了Ir(III)催化的空前温和的C H H酰胺化,用于弱配位的环状N-磺酰基酮亚胺,由一个单保护的1-氨基酸促进。该方法与催化量的三氟甲磺酸银一起使用1,4,2-二恶唑-5-酮作为强力酰胺化试剂。它具有很高的选择性,不需要化学计量的氧化剂或添加剂。进行了一系列的机械实验,以获取对反应机理的一些见解。该策略可轻松获得具有药学相关功能的新型苯并舒坦-喹唑啉和苯并舒坦-喹唑啉酮杂合支架。