Nucleophilic Substitution Reactions of Alkyl Halides by Using New Polymer-Supported Reagents Containing Hemin
作者:Kiyoshi Saito、Kaoru Harada
DOI:10.1246/bcsj.62.2562
日期:1989.8
hemin, divinylbenzene, and 2-methyl-5-vinylpyridine was synthesized by suspension copolymerization. Substitution reactions of primary, secondary, and tertiary alkylhalides with the hemin copolymer combined with cyanide, azide, and thiocyanate ions were given satisfactory yields. This reaction mechanism was revealed to be a SNi type on the basis of stereochemical study. The hemin copolymer was not only
product. Various new cis- and trans-1-(teri-butylamino)-2-benzyl- 2-methylcyclopropane-carbonitriles and the corresponding cyclopropanecarboxamides have been synthesized, with focus on the isolation of the pure stereoisomeric cyclopropanecarboxamides. The relative configuration of the stereoisomers was established by X-ray crystallographic analysis of one of the model compounds. A new route to the latter
2-氨基-4-氯-3,3-二甲基丁腈与叔丁醇钾在THF中的直接环化得到1-氨基-2,2-二甲基环丙烷-1-腈和二聚产物。已经合成了各种新的顺式和反式 1-(叔丁基氨基)-2-苄基-2-甲基环丙烷甲腈和相应的环丙烷甲酰胺,重点是纯立体异构环丙甲酰胺的分离。立体异构体的相对构型是通过一种模型化合物的 X 射线晶体学分析建立的。通过 1-甲氧基环丙胺与氰化钾的反应,开发了获得后者官能化环丙烷的新途径。报道了通过 Favorskii 衍生的中间体将 1-氨基环丙烷-1-腈重排为氮杂环丁烷和恶嗪衍生物的一些显着重排。
Iron-catalysed 1,2-aryl migration of tertiary azides
1,2-Arylmigration of α,α-diaryl tertiary azides was achieved by using the catalytic system of FeCl2/N-heterocyclic carbene (NHC) SIPr·HCl. The reaction generated aniline products in good yields after one-pot reduction of the migration-resultant imines.
A Direct Brønsted Acid-Catalyzed Azidation of Benzhydrols and Carbohydrates
作者:Jeffery Regier、Robert Maillet、Yuri Bolshan
DOI:10.1002/ejoc.201900104
日期:2019.4.9
HBF4·OEt2 complex was used as an efficient Brønsted acid catalyst for direct azidation reactions on substrates bearing benzhydryl and anomeric alcohols. This methodology demonstrated excellent functional group tolerance to both electron‐rich and electron‐poor benzhydrylalcohols as well as unprotected functional groups.
Direct AlCl<sub>3</sub>-catalyzed transformation of benzyl THP ethers and allyl benzyl ethers
作者:Tien Tan Bui、Hee-Kwon Kim
DOI:10.1080/00397911.2020.1829644
日期:2021.2.1
THP and allyl groups are frequently used for the protection of alcohols. In this study, novel direct transformations of benzyl THP ethers and allyl benzyl ethers, protected forms of alcohols, are r...