Synthesis of Functionalized Epoxides by Copper-Catalyzed Alkylative Epoxidation of Allylic Alcohols with Alkyl Nitriles
作者:Ala Bunescu、Qian Wang、Jieping Zhu
DOI:10.1021/acs.orglett.5b00571
日期:2015.4.17
A copper-catalyzed oxyalkylation of allylic alcohols using nonactivated alkyl nitriles as reaction partners was developed. A sequence involving generation of an alkyl nitrile radical followed by its addition to a double bond and a copper-mediated formation of C(sp3)–O bond was proposed to account for the reaction outcome. The protocol provided an efficient route to functionalized tri- and tetrasubstituted
Reactions of Cp2Ti(CO)2 with aldehydes and ketones
作者:T.L. Chen、T.H. Chan、Alan Shaver
DOI:10.1016/0022-328x(84)85103-7
日期:1984.6
Aromatic aldehydes are coupled by Cp2Ti(CO)2 to give pinacols and olefins in good yields. Aliphatic aldehydes react to give mainly the corresponding alcohols. Aromaticketones give a mixture of products.
Aerobic epoxidation of tertiary allylic alcohols remains a significant challenge. Reported here is an efficient and highly chemoselective copper‐catalyzed epoxidation and semipinacol rearrangement reaction of tertiary allylic alcohols with molecular oxygen. The solvent 1,4‐dioxane activates dioxygen, thereby precluding the addition of a sacrificial reductant.
Electrophilic Trifluoromethylthiolation/Semipinacol Rearrangement: Preparation of β-SCF<sub>3</sub> Carbonyl Compounds with α-Quaternary Carbon Center
作者:Chao-Chao Xi、Zhi-Min Chen、Shu-Yu Zhang、Yong-Qiang Tu
DOI:10.1021/acs.orglett.8b01627
日期:2018.7.20
A new and modular electrophilic trifluoromethylthiolation/semipinacol rearrangement of allylic silyl ethers has been developed under mild conditions. This approach allows the formation of a number of β-SCF3 carbonyl compounds with a cyclic and all-carbon quaternary center framework in moderate to good yields. It should be noted that this achievement is a metal-free process and just requires the use
Electrochemical halogenation/semi-pinacol rearrangement of allylic alcohols using inorganic halide salt: an eco-friendly route to the synthesis of β-halocarbonyls
An efficient and eco-friendly electrochemical method involving halogenation/semi-pinacol rearrangement of allylic alcohols using inorganic halide salt as the halogen source to synthesize various β-halocarbonyls bearing an all-carbon α-quaternary center undermild reaction conditions has been developed (X = Br, Cl). Stoichiometric oxidants, metal catalysts, and even external electrolytes were avoided