Chiral Diarylmethanes via Copper-Catalyzed Asymmetric Allylic Arylation with Organolithium Compounds
作者:Sureshbabu Guduguntla、Valentín Hornillos、Romain Tessier、Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1021/acs.orglett.5b03396
日期:2016.1.15
A highly enantioselective copper/N-heterocyclic carbene catalyzed allylic arylation with organolithium compounds is presented. The use of commercial or readily prepared aryllithium reagents in the reaction with allyl bromides affords a variety of chiral diarylvinylmethanes, comprising a privileged structural motif in pharmaceuticals, in high yields with good to excellent regio- and enantioselectivities
作者:Khalid B. Selim、Yasumasa Matsumoto、Ken-ichi Yamada、Kiyoshi Tomioka
DOI:10.1002/anie.200904676
日期:2009.11.2
Gamma rules: The title reaction was achieved in a highly regioselective manner using aryl Grignardreagents with monodentate chiral N‐heterocyclic carbene–copper(I) catalyst to give diarylvinylmethanes with excellent enantiomeric excess in excellent yield (see scheme).
ylides from glycine pyrazoleamides and allyl bromides were achieved by employing a chiral N,N′-dioxide/MgII complex as the catalyst. This protocol provided a facile and efficient synthesis route to a series of anti-α-amino acid derivatives in good yields with high stereoselectivities. Moreover, a possible catalytic cycle was proposed to illustrate the reaction process and the origin of stereoselectivity