Stille Cross-Couplings of Unactivated Secondary Alkyl Halides Using Monoorganotin Reagents
摘要:
The first catalyst that achieves Stille cross-couplings of secondary (as well as primary) alkyl halides has been developed. The method employs easily handled and inexpensive catalyst components (NiCl2 and 2,2'-bipyridine) and, through the use of monoorganotin reagents, avoids the formation of toxic and difficult-to-remove triorganotin side products.
Norbornene and norbornadiene derivatives have been shown to react with aryl and vinyl halides in the presence of a palladium catalyst, formic acid, and tributylamine or piperidine to give hydroarylated and hydrovinylated derivatives in good to high yield. Extension of the reaction to the hindered α,β-unsaturated aldehydic system of myrtenal produced a monocyclic derivative through a palladium-catalyzed
Monodisperse amorphous CuB<sub>23</sub> alloy short nanotubes: novel efficient catalysts for Heck coupling of inactivated alkyl halides and alkenes
作者:Fan Yang、Shi Yan Fu、Wei Chu、Chun Li、Dong Ge Tong
DOI:10.1039/c4ra08517e
日期:——
Heck-type coupling of inactivated alkylhalides and alkenes, catalyzed by amorphous CuB23 alloy short nanotubes, has been developed. Such couplings occur on the surfaces of nanotubes via a single-electron oxidative reaction. The results indicate that CuB23 nanotubes are efficient catalysts to replace Pd and Ni complexes for such Heck-type coupling.
Catalytic asymmetric hydroalkenylation of norbornene (bicyclo[2.2.1]hept-2-ene) can be performed in 93% e.e. using 1-methyl-2-(ethoxycarbonyl)ethenyl triflate 5 as alkenylation agent and Pd(R)-binap}2 as chiral catalyst.
降冰片烯(双环[2.2.1]庚-2-烯)的催化不对称加氢烯基化可以在 93% e.e. 下进行。使用1-甲基-2-(乙氧基羰基)乙烯基三氟甲磺酸酯5作为烯基化剂和Pd(R)-binap}2作为手性催化剂。