ALDEHYDE-SELECTIVE WACKER-TYPE OXIDATION OF UNBIASED ALKENES
申请人:CALIFORNIA INSTITUTE OF TECHNOLOGY
公开号:US20140316149A1
公开(公告)日:2014-10-23
This disclosure is directed to methods of preparing organic aldehydes, each method comprising contacting a terminal olefin with an oxidizing mixture comprising:
(a) a dichloro-palladium complex;
(b) a copper complex;
(c) a source of nitrite;
under aerobic reaction conditions sufficient to convert at least a portion of the terminal olefin to an aldehyde.
Catalyst-Controlled Wacker-Type Oxidation: Facile Access to Functionalized Aldehydes
作者:Zachary K. Wickens、Kacper Skakuj、Bill Morandi、Robert H. Grubbs
DOI:10.1021/ja411749k
日期:2014.1.22
The aldehyde-selective oxidation of alkenes bearing diverse oxygen groups in the allylic and homoallylic position was accomplished with a nitrite-modifiedWackeroxidation. Readily available oxygenated alkenes were oxidized in up to 88% aldehyde yield and as high as 97% aldehyde selectivity. The aldehyde-selective oxidation enabled the rapid, enantioselective synthesis of an important pharmaceutical
Borenium Ion Catalyzed Hydroboration of Alkenes with N-Heterocyclic Carbene-Boranes
作者:Aleksandrs Prokofjevs、Anne Boussonnière、Linfeng Li、Hélène Bonin、Emmanuel Lacôte、Dennis P. Curran、Edwin Vedejs
DOI:10.1021/ja305061c
日期:2012.7.25
Treatment of alkenes such as 3-hexene, 3-octene, and 1-cyclohexyl-1-butene with the N-heterocyclic carbene (NHC)-derived borane 2 and catalytic HNTf2 (Tf = trifluoromethanesulfonyl (CF3SO2)) effects hydroboration at room temperature. With 3-hexene, surprisingly facile migration of the boron atom from C(3) of the hexyl group to C(2) was observed over a time scale of minutes to hours. Oxidative workup gave a mixture of alcohols containing 2-hexanol as the major product. A similar preference for the C(2) alcohol was observed after oxidative workup of the 3-octene and 1-cyclohexyl-1-butene hydroborations. NHC-borenium cations (or functional equivalents) are postulated as the species that accomplish the hydroborations, and the C(2) selective migrations are attributed to the four center interconversion of borenium cations with cationic NHC-borane-olefin pi-complexes.
US9586883B2
申请人:——
公开号:US9586883B2
公开(公告)日:2017-03-07
Use of a benzyl ether as a traceless hydrogen donor in the anti-Markovnikov hydrofunctionalization of alkenes with xanthates
A new protocol for the anti-Markovnikovhydrofunctionalization of alkenyl alcohol O-Bn ethers was developed using xanthates as functionalizing agents in the presence of lauroyl peroxide as a radical initiator and a stoichiometric oxidant. The benzylgroup serves as a tracelesshydrogendonor in the remote radical hydrogen atom transfer event during the process.