Electrochemical Oxidative Aryl(alkyl)trifluoromethylation of Allyl Alcohols via 1,2-Migration
作者:Zhipeng Guan、Huamin Wang、Yange Huang、Yunkun Wang、Shengchun Wang、Aiwen Lei
DOI:10.1021/acs.orglett.9b01518
日期:2019.6.21
An electrochemical oxidative difunctionalization of allyl alcohols for the synthesis of β-trifluoromethyl ketones is achieved through a 1,2-migration process. A series of β-trifluoromethyl ketones can be facilely obtained utilizing CF3SO2Na as a radical source, eliminating the use of metals and sacrificial chemical oxidants. Importantly, this protocol not only realizes aryl migration but also offers
通过1,2-迁移过程可实现烯丙醇的电化学氧化双官能化,以合成β-三氟甲基酮。利用CF 3 SO 2 Na作为自由基源可以轻松获得一系列β-三氟甲基酮,而无需使用金属和牺牲性化学氧化剂。重要的是,该协议不仅实现了芳基迁移,而且还提供了烷基迁移产物。另外,电化学催化的环膨胀和克级反应证明了该方案的合成有用性。
[4+2] Cycloadditions of Seven‐Membered‐Ring trans‐Alkenes: Decreasing Reactivity with Increasing Substitution of the Seven‐Membered Ring
作者:John Santucci、Jillian R. Sanzone、K. A. Woerpel
DOI:10.1002/ejoc.201600329
日期:2016.6
in [4+2] cycloadditions depends on the substitution pattern on the seven-membered ring. Unhindered trans-alkenes undergo [4+2] cycloadditions with 1,3-diphenylisobenzofuran faster than the most reactive trans-cyclooctene. Increasing the substitution of the seven-membered ring or increasing the electron density of the trans-alkene decreases reactivity with 1,3-dienes in concerted cycloaddition reactions
Catalytic Radical–Polar Crossover Reactions of Allylic Alcohols
作者:Eric E. Touney、Nicholas J. Foy、Sergey V. Pronin
DOI:10.1021/jacs.8b12075
日期:2018.12.12
Radical-polarcrossover hydrofunctionalizations of tertiary allylic alcohols are described. Depending on the structure of the catalyst, corresponding epoxides or semipinacol rearrangement products are selectively obtained in good yields. Experimental evidence points to the participation of alkylcobalt complexes as electrophilic intermediates.
A novel synthesis of homologated allylic alcohols using dimethylsulphonium methylide
作者:J.J. Harnett、L. Alcaraz、C. Mioskowski、J.P. Martel、T. Le Gall、Dong-Soo Shin、J.R. Falck
DOI:10.1016/s0040-4039(00)73035-8
日期:1994.3
The reaction of excess dimethylsulphonium methylide with various aliphatic and aromatic ketones leads exclusively to homologated allylic alcohols in good yields.
过量的二甲基亚砜甲基化物与各种脂族和芳族酮的反应仅以良好的收率产生均聚的烯丙基醇。
Synthesis of Spirocyclic Butenolides by Ring Closing Metathesis
作者:Peter Langer、Uwe Albrecht
DOI:10.1055/s-2002-34906
日期:——
Spirocyclic butenolides were efficiently prepared by a ring closing metathesis strategy.