Synthesis of 1- and 4-substituted piperazin-2-ones via Jocic-type reactions with N-substituted diamines
作者:Michael S. Perryman、Matthew W. M. Earl、Sam Greatorex、Guy J. Clarkson、David J. Fox
DOI:10.1039/c4ob02311k
日期:——
Enantiomerically-enriched trichloromethyl-containing alcohols are transformed regioselectively into enantiomerically-enriched 1-substituted piperazinones by modified Jocic reactions.
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