Pd/C-Catalyzed Aminocarbonylation of Aryl Iodides with Anthranils in Water Using Mo(CO)<sub>6</sub>
as the CO Source
作者:Zechao Wang、Zhiping Yin、Xiao-Feng Wu
DOI:10.1002/chem.201703994
日期:2017.10.26
anthranils with various hindered and functionalized aryl iodides, the desired amides were afforded in moderate to good yields. The protocol is advantageous due to the recyclable Pd/C catalyst, safe Mo(CO)6 as the solid CO source, and environmentally benign water as solvent. No inert atmosphere protection is needed.
Cp*Co(III)‐Catalyzed
<i>o</i>
‐Amidation of Benzaldehydes with Dioxazolones Using Transient Directing Group Strategy
作者:Bhuttu Khan、Vikas Dwivedi、Basker Sundararaju
DOI:10.1002/adsc.201901267
日期:2020.3.4
metal‐catalyzed ortho‐selective C(sp2)−H amidation of weakly coordinating aldehydes remains limited to precious metals such as Ir, Rh, Ru, etc. Herein, we put forward a novel report on ortho‐amidation of benzaldehydes employing user‐friendly dioxazolones under cost‐effective and air‐stable Cp*Co(III) catalysis. This catalytic transformation involves transient directing group strategy to enhance the ligating
Rh-catalyzed Transient Directing Group Promoted C-H Amidation of Benzaldehydes Utilizing Dioxazolones
作者:Xiaoyang Wang、Song Song、Ning Jiao
DOI:10.1002/cjoc.201700726
日期:2018.3
Transition‐metal catalyzedC—H functionalization of benzaldehydes is of great interest in organic synthesis. Herein, we developed a transient directing group assisted amidation of benzaldehydes catalyzed by rhodium catalyst. With the employment of 10 mol% of 4‐trifluoromethyl aniline, the in situ generated imine groups as the directing group efficiently enable this transformation. By using this protocol
KOtBu-mediated stereoselective addition of quinazolines to alkynes under mild conditions
作者:Dan Zhao、Qi Shen、Yu-Ren Zhou、Jian-Xin Li
DOI:10.1039/c3ob41083h
日期:——
A facile alkenylation of quinazolines with unactivated terminal alkynes has been achieved in the presence of KOtBu without the aid of any transition metal catalysts. The reaction is carried out under very mild conditions and shows a high stereoselectivity. A possible radical-based mechanism is also explored.
Organocatalytic Enantioselective Formal (4 + 2)-Cycloadditions of Phosphine-Containing Dipoles with Isocyanates
作者:Xuling Chen、Tao Wang、Zhongyue Lu、Pengfei Li
DOI:10.1021/acs.orglett.2c01154
日期:2022.4.29
Phosphine-catalyzed enantioselective formal (4 + 2)-cycloadditions of 2-(4H-benzo[d][1,3]oxazin-4-yl)acrylates with isocyanates have been developed for the first time. The initial SN2′ attack of the chiral phosphine organocatalyst on 2-(4H-benzo[d][1,3]oxazin-4-yl)acrylates generated the key phosphine-containing dipolar intermediates, and the subsequent formal cycloaddition with isocyanates furnished
首次开发了膦催化的 2-(4 H-苯并[ d ][1,3]恶嗪-4-基)丙烯酸酯与异氰酸酯的对映选择性形式 (4 + 2)-环加成反应。手性膦有机催化剂对 2-(4 H-苯并[ d ][1,3]oxazin-4-yl) 丙烯酸酯的初始 S N 2' 攻击产生了关键的含膦偶极中间体,随后与异氰酸酯以 60-84% 的收率和 61-92% 的 ee 提供范围广泛的 3,4-二氢喹唑啉-2-酮。