摘要苯甲酰基的选择性脱保护是有机合成领域非常重要的方法。在过去的 60 年里,研究和开发了各种脱苯甲酰化方法,但现在强烈需要更有用和选择性的策略。为了响应这一强烈需求,我们开发了使用二溴化钐 (II) 和质子源对苯甲酰基进行新型选择性脱保护。该脱保护反应顺利进行并且以良好至极好的产率获得所需化合物。在本文中,我们将报告这种脱保护反应的细节。图形概要
Facile Oxidation of Aldehydes to Esters Using S·SnO<sub>2</sub>/SBA-1–H<sub>2</sub>O<sub>2</sub>
作者:Guang Qian、Rui Zhao、Dong Ji、Gaomeng Lu、Yanxing Qi、Jishuan Suo
DOI:10.1246/cl.2004.834
日期:2004.7
A highly efficient, mild, and simple procedure has been described for the oxidation of aldehydes to corresponding esters in alcohols with S·SnO2/SBA-1 as catalyst and H2O2 as the oxidant, and the catalytic systems can be used in the preparation of a broad range of esters. Oxidation of aldehydes to corresponding esters utilizing H2O2 as the oxidant without any metal catalyst is also reported.
Construction of Esters through Sulfuryl Fluoride (SO2F2) Mediated Dehydrative Coupling of Carboxylic Acids with Alcohols at Room Temperature
作者:Shi-Meng Wang、Njud S. Alharbi、Hua-Li Qin
DOI:10.1055/s-0039-1690017
日期:2019.10
on gram scale. A facile method for the construction of esters through dehydrative coupling of carboxylic acids with alcohols is developed. The reactions are mediated by sulfuryl fluoride (SO2F2) at room temperature and proceed with high efficiency. The method has several advantages including broad substrate scope, mild conditions, excellent functional group compatibility and affords high yields, even
抽象的 开发了一种通过羧酸与醇类的脱水偶合来构建酯的简便方法。该反应在室温下由硫酰氟(SO 2 F 2)介导,并以高效率进行。该方法具有许多优点,包括广泛的底物范围,温和的条件,出色的官能团相容性,即使在克级上也能提供高收率。 开发了一种通过羧酸与醇类的脱水偶合来构建酯的简便方法。该反应在室温下由硫酰氟(SO 2 F 2)介导,并以高效率进行。该方法具有许多优点,包括广泛的底物范围,温和的条件,出色的官能团相容性,即使在克级上也能提供高收率。
LiHMDS: Facile, highly efficient and metal-free transesterification under solvent-free condition
作者:Lavanya L. Mittapelli、Kiran R. Gore
DOI:10.1016/j.catcom.2020.106194
日期:2021.1
transesterification reaction in the presence of LiHMDS undersolvent-free conditions. The transesterification reaction was carried out with three different benzoate esters and a wide range of primary and secondary alcohols (from C3-C18) in good to excellent yields (45 examples). By considering the commercial role of esters, this method will be promising for the facile synthesis of esters in industry-relevant applications
Diacyl Disulfide: A Reagent for Chemoselective Acylation of Phenols Enabled by 4-(<i>N</i>,<i>N</i>-Dimethylamino)pyridine Catalysis
作者:Hong-Xin Liu、Ya-Qian Dang、Yun-Fei Yuan、Zhi-Fang Xu、Sheng-Xiang Qiu、Hai-Bo Tan
DOI:10.1021/acs.orglett.6b02818
日期:2016.11.4
A general and excellent acylation reagent, diacyl disulfide, was uncovered for efficient ester formation enabled by DMAP (4-(N,N-dimethylamino)pyridine) catalysis. This protocol offered a promising synthetic platform on site-selective acylation of phenolic and primary aliphatic hydroxyl groups, which greatly expanded the realm of protecting group chemistry. The importance of the reagent was also reflected
our findings on a novel and cheap NiCl2 catalytic system under ligand-free conditions for the efficient thiocarbonylation, alkoxycarbonylation and amidocarbonylation reactions of aryl iodides in the presence of Cr(CO)6 as the solid source of carbon monoxide under air. A variety of aryl iodides tolerated the reaction conditions and structurally different thiols, alcohols and amines were used efficiently