An episulfonium ion mediated ring expansion of 1-alkenylcycloakanols
作者:Sunggak Kim、Jung Ho Park
DOI:10.1016/s0040-4039(01)93336-2
日期:——
It has been found that TBDMS ethers of 1-alkenylcycloalkanols are readily rearranged to the ring expanded α-(1-phenylthioalkyl)cycloalkanones in high yields via episulfonium ions.
α-Quaternary Mannich Bases through Copper-Catalyzed Amination-Induced 1,2-Rearrangement of Allylic Alcohols
作者:Wei-Zhi Weng、Jian-Guo Sun、Ping Li、Bo Zhang
DOI:10.1002/chem.201702428
日期:2017.7.21
A novel copper‐catalyzed amination‐induced 1,2‐rearrangement reaction of allylic alcohols has been developed under simple and mild conditions. The commercially available N‐fluorobenzenesulfonimide (NFSI) is employed as an amination reagent. In this transformation, not only alkyl, but also aryl substituents can efficiently undergo 1,2‐carbon atom migration, thereby providing an efficient and powerful
Synthesis of Macrocyclic Ketones through Catalyst-Free Electrophilic Halogen-Mediated Semipinacol Rearrangement: Application to the Total Synthesis of (±)-Muscone
作者:Yi Liu、Ying-Yeung Yeung
DOI:10.1021/acs.orglett.7b00350
日期:2017.3.17
The rearranged products could further undergo Dowd–Beckwith rearrangement to give the corresponding one-carbon ring-expanded ketones. This approach has been applied to the total synthesis of the natural product (±)-muscone, which is widely used in modern perfumery and medicines, in a two-step sequence.
Aerobic C–C Bond Cleavage of Allylic Alcohols via Co-Catalyzed Hydrogen Atom Transfer
作者:Meng Deng、Mengqi Chu、Nan Li、Guohui Sun、Fei Li、Dade Guo、Guohui Kang、Baoming Ji
DOI:10.1021/acs.orglett.3c00556
日期:——
alcohols to access ketones. This novel approach presents excellent chemoselectivity, good functional group compatibility, and high yields. This reaction occurs through a HAT-initiated peroxide intermediate, and an adjacent glycol-type diradical fragmentation process is recommended.
已经开发出一种简单、有效的方法,用于 Co III -H 催化的叔烯丙醇的有氧 C-C 键裂解以获得酮。这种新方法具有出色的化学选择性、良好的官能团相容性和高产率。该反应通过 HAT 引发的过氧化物中间体发生,建议使用相邻的乙二醇型双自由基裂解过程。
Electrochemical synthesis of γ-keto sulfones containing a β-quaternary carbon center <i>via</i> 1,2-migration
An effective electrochemical rearrangement reaction, both oxidant and metal catalyst-free, is presented to construct γ-keto sulfones containing a β-quaternary carbon center in this study. In the protocol, radicals are generated from benzenesulfonyl hydrazines, which cause 1,2-migrations of starting materials, 2-methylallyl alcohol derivatives, and formation of new C–C and C–S bonds. A series of aryl-migration