Iridium-Catalyzed Highly Efficient and Site-Selective Deoxygenation of Alcohols
作者:Shiyi Yang、Weiping Tang、Zhanhui Yang、Jiaxi Xu
DOI:10.1021/acscatal.8b02495
日期:2018.10.5
An iridium-catalyzed, highly efficient, and site-selective deoxygenation of primary, secondary, and tertiary alcohols has been realized, under the assistance of a 4-(N-substituted amino)aryl directing group. Only the hydroxyl adjacent to the directing group can be deoxygenated. The deoxygenation is performed in water, with formic acid as both the promoter and hydride donor. Excellent yields and functionality
Iridium‐Catalysed Reductive Deoxygenation of Ketones with Formic Acid as Traceless Hydride Donor
作者:Zhiheng Yang、Xueya Zhu、Shiyi Yang、Weiyan Cheng、Xiaojian Zhang、Zhanhui Yang
DOI:10.1002/adsc.202000821
日期:2020.12.8
An iridium‐catalysed deoxygenation of ketones and aldehydes is achieved, with formic acid as hydride donor and water as co‐solvent. At low catalyst loading, a number of 4‐(N,N‐disubstituted amino) arylketones are readily deoxygenated in excellent yields and chemoselectivity. Numerous functional groups, especially phenolic and alcoholic hydroxyls, secondary amine, carboxylic acid, and alkyl chloride
以甲酸为氢化物供体,水为助溶剂,实现了铱催化的酮和醛的脱氧。在低催化剂负载下,许多4-(N,N-二取代氨基)芳基酮易于脱氧,具有出色的收率和化学选择性。许多官能团,尤其是酚羟基和醇羟基,仲胺,羧酸和烷基氯,都具有良好的耐受性。当使用DCO 2 D和D 2 O代替它们的氢化对应物时,可获得双歧化的双链烷烃达90%。激活4‐(N,N已证明二取代氨基)芳基会经历各种有用的转化。脱氧氘已用于制备氘代药物分子Chlorambucil-4,4- d 2。
Benzotriazole: A novel synthetic auxiliary
作者:Alan R. Katritzky、Stanislaw Rachwal、Gregory J. Hitchings
DOI:10.1016/s0040-4020(01)87080-0
日期:1991.1
eliminated to form products of type Bt-CHR-NR′R″. The latter are versatile intermediates for the preparation of primary, secondary, and tertiary amines and in the alkylation of hydroxylamines, hydrazines, amides, thioamides, and sulfonamides. Polyfunctional amines and other polyfunctional compounds can also be prepared, and they enable significant extending of Mannich reaction.
From Waste Biomass to Solid Support: Lignosulfonate as a Cost-Effective and Renewable Supporting Material for Catalysis
作者:Shaohuan Sun、Rongxian Bai、Yanlong Gu
DOI:10.1002/chem.201303364
日期:2014.1.7
2) lignin‐SO3Cu(OTf), and 3) lignin‐IL@NH2 (IL=ionic liquid). These solidmaterials were then examined in many organic transformations. It was finally found that, compared with its homogeneous counterpart as well as some other solid catalysts that are prepared by using different supports with the same metal or catalytically active species, the lignin‐supported catalysts showed better performance in these reactions
FeCl3 as Lewis acid catalyzed one-pot three-component aza-Friedel–Crafts reactions of indoles, aldehydes, and tertiary aromatic amines
作者:Jie Liu、Tao He、Lei Wang
DOI:10.1016/j.tet.2011.03.050
日期:2011.5
A new strategy for the synthesis of 3-diarylmethyl indoles was developed through FeCl3 as Lewisacidcatalyzedthree-component aza-Friedel–Crafts reactions of indoles, aldehydes, and tertiary aromatic amines in one-pot. The reactions generated the corresponding 3-diarylmethyl indoles in good yields under mild reaction conditions by using less expensive, readily available, and environmentally benign