Dynamic Kinetic Asymmetric [3 + 2] Annulation Reactions of Aminocyclopropanes
作者:Florian de Nanteuil、Eloisa Serrano、Daniele Perrotta、Jerome Waser
DOI:10.1021/ja5024578
日期:2014.4.30
asymmetric [3 + 2] annulation reaction of aminocyclopropanes with both enol ethers and aldehydes. Using a Cu catalyst and a commercially available bisoxazoline ligand, cyclopentyl- and tetrahydrofurylamines were obtained in 69-99% yield and up to a 98:2 enantiomeric ratio using the same reaction conditions. The method gives access to important enantio-enriched nitrogen building blocks for the synthesis of bioactive
Novel quinazolinamide derivatives of the formula (I), in which R
1
-R
3
have the meanings indicated in Claim
1,
are HSP90 inhibitors and can be used for the preparation of a medicament for the treatment of diseases in which the inhibition, regulation and/or modulation of HSP90 plays a role.
An efficient in situ prepared superacid BF3–H2O promoted benzylation of arenes using benzyl alcohols and acetates achieves various diarylalkanes.
一种高效的原位制备的超强酸BF3-H2O促进的芳烃苄基化反应,使用苄醇和醋酸酯制备各种二芳基烷烃。
Reusable ionic liquid-catalyzed oxidative esterification of carboxylic acids with benzylic hydrocarbons via benzylic Csp<sup>3</sup>–H bond activation under metal-free conditions
作者:Fen Mou、Yadong Sun、Weiwei Jin、Yonghong Zhang、Bin Wang、Zhiqing Liu、Lei Guo、Jianbin Huang、Chenjiang Liu
DOI:10.1039/c7ra02788e
日期:——
A metal-free protocol for the direct oxidativeesterification of the Csp3–H bond in benzylic hydrocarbons with carboxylic acids using heterocyclic ionic liquid as catalyst has been reported. The catalyst 1-butylpyridinium iodide could be easily recycled and reused for at least four cycles without obvious loss of catalytic activity.
The paper describes a cooperative NHC (N‐heterocyclic carbene) and ruthenium‐based redox catalysis for the mild aerobic oxidative esterification of various aromatic and heteroaromatic aldehydes. The ruthenium(II) complex Ru(bpz)3(PF6)2 (bpz=2,2′‐bipyrazine) as catalyst is shown to be compatible with free NHCs. The NHC is used in these cascade reactions for the umpolung of the aldehyde to form the corresponding