aerobic oxidative cyclization of β,γ-unsaturated hydrazones for the preparation of pyrazole derivatives has been developed. The hydrazonyl radical promoted the cyclization, along with a concomitant C═Cbondcleavage of β,γ-unsaturated hydrazones. This process has been verified via several control experiments, including a radical-trapping study, an 18O-labeling method, and the identification of the possible
Copper-mediated oxysulfonylation of alkenyl oximes with sodium sulfinates: a facile synthesis of isoxazolines featuring a sulfone substituent
作者:Li-Jing Wang、Manman Chen、Lin Qi、Zhidong Xu、Wei Li
DOI:10.1039/c7cc00090a
日期:——
A novel and efficient Cu(OAc)2-mediated oxysulfonylation of alkenyl oximes with sodium sulfonates was developed. The reactions are easy to conduct, occur under mild conditions, and form a broad range of...
Organocatalytic Redox Isomerization of Electron-Deficient Allylic Alcohols: Synthesis of 1,4-Ketoaldehydes
作者:Keshab Mondal、Buddhadeb Mondal、Subhas Chandra Pan
DOI:10.1021/acs.joc.6b00243
日期:2016.6.3
An organocatalytic redox isomerization strategy has been developed for the synthesis of 1,4-ketoaldehydes. DABCO was found to be the best catalyst for the isomerization of γ-hydroxy enones. With 20 mol % of DABCO as catalyst and DMSO as the solvent high yields have been achieved for different 1,4-ketoaldehydes.
Biocatalysis in Organic Synthesis. 9. Highly Enantioselective Kinetic Resolution of Secondary Alcohols Catalyzed by Acylase.<sup>1</sup>
作者:Juan Faraldos、Elisa Arroyo、Bernardo Herradón
DOI:10.1055/s-1997-796
日期:1997.4
A new catalytic activity of the enzyme acylase I (AA-I) from Aspergillus species has been found. Although this enzyme had previously been used only in the hydrolysis of N-acylamino acids, we have found that it is a highly efficient catalyst for transesterifications using vinyl esters as acyl donors. The method has been applied to the kinetic resolution of a variety of secondary alcohols.
发现了来自阿斯pergillus物种的酶酰化酶 I (AA-I) 的一种新催化活性。尽管该酶之前仅用于水解 N-酰基氨基酸,但我们发现它是使用乙烯基酯作为酰基供体进行转酯化反应的高效催化剂。该方法已应用于多种次级醇的动力学分辨。
Regioselective Synthesis of Arylsulfonyl Benzophenones via Aerobic Oxidative [3+3] Benzannulation Reactions
作者:Deepak Yadav、Prabhakar R. Joshi、Sunil K. Sharma、Rajeev S. Menon
DOI:10.1002/ejoc.202000931
日期:2020.10.31
Regioselective synthesis of sulfonylated benzophenone derivatives through DBU‐mediated, oxidative [3+3] benzannulationreaction of α,β‐unsaturated carbonyl compounds and 4‐sulfonyl butenones has been developed.