Enantioselective Organocatalytic Synthesis of 2-Oxopiperazines from Aldehydes: Identification of the Elusive Epoxy Lactone Intermediate
作者:Nikolaos Kaplaneris、Constantinos Spyropoulos、Maroula G. Kokotou、Christoforos G. Kokotos
DOI:10.1021/acs.orglett.6b02699
日期:2016.11.18
organocatalytic linchpin catalysis approach was envisaged to convert simple aldehydes into enantioenriched 2-oxopiperazines. A four-step reaction sequence (chlorination, oxidation, substitution, and cyclization) was developed and led to different substitution patterns in high yields and selectivities. The reaction mechanism was studied, and the previously elusive epoxy lactone intermediate was identified by
2,3-Indole-fused 1,4-diazocines represent a new family of indole alkaloid compounds and are difficult to access by the reported protocols. Herein, we report a copper-catalyzed decarboxylative cyclization of cyclic propargylic carbamates with imidazolidines via sequential C–N/C–N/C–C bondformation to deliver a series of 2,3-indole-fused 1,4-diazocines, with a broad substrate scope and mild conditions
Eckstein; Lukasiewicz, Bulletin de l'Academie Polonaise des Sciences, Serie des Sciences Chimiques, 1959, vol. 7, p. 789,790,795
作者:Eckstein、Lukasiewicz
DOI:——
日期:——
Synthesis and biological evaluation of novel cYY analogues targeting Mycobacterium tuberculosis CYP121A1
作者:Safaa M. Kishk、Kirsty J. McLean、Sakshi Sood、Mohamed A. Helal、Mohamed S. Gomaa、Ismail Salama、Samia M. Mostafa、Luiz Pedro S. de Carvalho、Andrew W. Munro、Claire Simons
DOI:10.1016/j.bmc.2019.02.051
日期:2019.4
The rise in multidrug resistant (MDR) cases of tuberculosis (TB) has led to the need for the development of TB drugs with different mechanisms of action. The genome sequence of Mycobacterium tuberculosis (Mtb) revealed twenty different genes coding for cytochrome P450s. CYP121A1 catalyzes a C-C crosslinking reaction of di-cyclotyrosine (cYY) producing mycocyclosin and current research suggests that either mycocyclosin is essential or the overproduction of cYY is toxic to Mtb. A series of 1,4-dibenzyl-2-imidazol-1-yl-methylpiperazine derivatives were designed and synthesised as cYY mimics. The derivatives substituted in the 4-position of the phenyl rings with halides or alkyl group showed promising antimycobacterial activity (MIC 6.25 mu g/mL), with the more lipophilic branched alkyl derivatives displaying optimal binding affinity with CYP121A1 (Pr-i K-D = 1.6 mu M; Bu-t K-D = 1.2 mu M). Computational studies revealed two possible binding modes within the CYP121A1 active site both of which would effectively block cYY from binding.
Chen, Scientia Sinica (English Edition), 1959, vol. 10, p. 168