Synthesis of 1- and 4-substituted piperazin-2-ones via Jocic-type reactions with N-substituted diamines.
Perryman, Michael S.; Earl, Matthew W. M.; Greatorex, Sam; Clarkson, Guy J.; Fox, David J.; Organic & biomolecular chemistry 13 (2015) 2360–2365; doi:10.1039/c4ob02311k

data_7154256
_publ_section_title
;
 Synthesis of 1- and 4-substituted piperazin-2-ones via Jocic-type
 reactions with N-substituted diamines.
;
_journal_issue                   8
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              2360
_journal_page_last               2365
_journal_paper_doi               10.1039/c4ob02311k
_journal_volume                  13
_journal_year                    2015
_chemical_formula_moiety         'C19 H22 N2 O'
_chemical_formula_sum            'C19 H22 N2 O'
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_space_group_crystal_system      triclinic
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Olex2 1.2
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2014-09-02 deposited with the CCDC.
2014-12-16 downloaded from the CCDC.
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_cell_angle_alpha                106.562(5)
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CrysAlisPro, Agilent Technologies,
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CrysAlisPro, Agilent Technologies,
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CrysAlisPro, Agilent Technologies,
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_diffrn_radiation_monochromator  graphite
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_diffrn_source                   'Enhance (Cu) X-ray Source'
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CrysAlisPro, Agilent Technologies,
Version 1.171.36.28 (release 01-02-2013 CrysAlis171 .NET)
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Empirical absorption correction using spherical harmonics,
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_exptl_crystal_colour            colourless
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 w=1/[\s^2^(Fo^2^)+(0.0662P)^2^+0.1517P]
 where P=(Fo^2^+2Fc^2^)/3
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'Adding full bibliography for 7154254--7154256.cif.'
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_olex2_refinement_description
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1. Fixed Uiso
 At 1.2 times of:
  All C(H,H) groups, H9 of C9, H21 of C21, H5 of C5, H2A of C2A, H2 of C2,
  H5A of C5A, H4 of C4, H20 of C20, H17 of C17, H18 of C18, H1A of C1A, H19 of
  C19, H4A of C4A, H1 of C1
 At 1.5 times of:
  H11 of C21
2. Others
 Sof(C1A)=Sof(H1A)=Sof(C2A)=Sof(H2A)=Sof(H3B)=Sof(C4A)=Sof(H4A)=Sof(C5A)=
 Sof(H5A)=1-FVAR(1)
 Sof(C1)=Sof(H1)=Sof(C2)=Sof(H2)=Sof(H3A)=Sof(C4)=Sof(H4)=Sof(C5)=Sof(H5)=
 FVAR(1)
3.a Ternary CH refined with riding coordinates:
 C9(H9)
3.b Secondary CH2 refined with riding coordinates:
 C7(H7A,H7B), C8(H8A,H8B), C12(H12A,H12B), C13(H13A,H13B), C15(H15A,H15B)
3.c Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C1A(H1A), C2A(H2A), C3(H3A), C3(H3B), C4(H4), C5(H5),
 C4A(H4A), C5A(H5A), C17(H17), C18(H18), C19(H19), C20(H20), C21(H21)
;