Cooperative NHC and Photoredox Catalysis for the Synthesis of β‐Trifluoromethylated Alkyl Aryl Ketones
作者:Qing‐Yuan Meng、Nadine Döben、Armido Studer
DOI:10.1002/anie.202008040
日期:2020.11.2
Despite the great potential of radical chemistry in organic synthesis, N‐heterocyclic carbene (NHC)‐catalyzed reactions involving radical intermediates are not well explored. This communication reports the three‐component coupling of aroyl fluorides, styrenes and the Langlois reagent (CF3SO2Na) to give various β‐trifluoromethylated alkylarylketones with good functional group tolerance in moderate to high
尽管自由基化学在有机合成中具有巨大潜力,但涉及自由基中间体的 N-杂环卡宾 (NHC) 催化反应尚未得到很好的探索。该通讯报道了芳酰氟、苯乙烯和 Langlois 试剂 (CF 3 SO 2 Na)的三组分偶联,通过光氧化还原/NHC 协同催化,以中等到高产率生成各种具有良好官能团耐受性的 β-三氟甲基化烷基芳基酮。烯烃酰基三氟甲基化通过羰基与苄基C-自由基的自由基/自由基交叉偶联进行。羰基自由基是通过原位形成的酰唑鎓离子的 SET 还原产生的,而苄基自由基则源自三氟甲基自由基加成到苯乙烯上。
Dynamic Kinetic Asymmetric Cross-Benzoin Additions of β-Stereogenic α-Keto Esters
作者:C. Guy Goodman、Jeffrey S. Johnson
DOI:10.1021/ja508521a
日期:2014.10.22
The dynamickineticresolution of β-halo α-keto esters via an asymmetric cross-benzoin reaction is described. A chiral N-heterocycliccarbenecatalyzes the umpolung addition of aldehydes to racemic α-keto esters. The resulting fully substituted β-halo glycolic ester products are obtained with high levels of enantio- and diastereocontrol. The high chemoselectivity observed is a result of greater electrophilicity
Enantioselective annulation of enals with 2-naphthols by triazolium salts derived from <scp>l</scp>-phenylalanine
作者:Guo-Tai Li、Qing Gu、Shu-Li You
DOI:10.1039/c5sc00731c
日期:——
The annulation reaction between enals and 2-naphthols catalyzed by a novel NHC affords enantioenriched β-arylsplitomicins in good yields and enantioselectivity.
NHC催化的烯醛和2-萘酚之间的环化反应产生了产率高且对映选择性良好的β-芳基裂孢霉素。
Hydrazide and alkoxyamide angiogenesis inhibitors
申请人:——
公开号:US20020002152A1
公开(公告)日:2002-01-03
Compounds having the formula
1
are methionine aminopeptidase type 2 (MetAP2) inhibitors and are useful for inhibiting angiogenesis. Also disclosed are MetAP2-inhibiting compositions and methods of inhibiting angiogenesis in a mammal.
N-Heterocyclic Carbene Catalyzed Dynamic Kinetic Resolution of Pyranones
作者:Changgui Zhao、Fangyi Li、Jian Wang
DOI:10.1002/anie.201508205
日期:2016.1.26
The dynamickineticresolution of 6‐hydroxypyranones with enals or alkynals through an asymmetric redox esterification is catalyzed by a chiral N‐heterocyclic carbene. The resulting esters are obtained in good to high yields and with high levels of enantio‐ and diastereocontrol. The reaction products are further derivatized to obtain functionalized sugar derivatives and natural products.