One-pot synthesis of 5H-1,3,4-thiadiazolo[3,2-a]pyrimidin-5-one derivatives
Dong, Hong Ru; Gao, Zhong Lian; Li, Rong Shan; Hu, Yi Ming; Dong, Heng Shan; Xie, Zhixiang; RSC Adv.  (2014) –; doi:10.1039/C4RA02714K

data_7218379
_publ_section_title
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 One-pot synthesis of 5H-1,3,4-thiadiazolo[3,2-a]pyrimidin-5-one
 derivatives
;
_journal_name_full               'RSC Adv.'
_journal_paper_doi               10.1039/C4RA02714K
_journal_year                    2014
_chemical_formula_sum            'C12 H9 N3 O2 S'
_chemical_formula_weight         259.28
_chemical_name_systematic
;
2-(4-methoxyphenyl)-5<i>H</i>-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 112.384(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   14.1942(13)
_cell_length_b                   13.4679(13)
_cell_length_c                   12.8940(12)
_cell_measurement_reflns_used    1276
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      25.27
_cell_measurement_theta_min      2.37
_cell_volume                     2279.2(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0336
_diffrn_reflns_av_sigmaI/netI    0.0355
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            5973
_diffrn_reflns_theta_full        25.49
_diffrn_reflns_theta_max         25.49
_diffrn_reflns_theta_min         2.17
_exptl_absorpt_coefficient_mu    0.281
_exptl_absorpt_correction_T_max  0.9231
_exptl_absorpt_correction_T_min  0.9082
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.511
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1072
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.29
_refine_diff_density_max         0.213
_refine_diff_density_min         -0.218
_refine_diff_density_rms         0.041
_refine_ls_extinction_coef       0.00053(16)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.026
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     165
_refine_ls_number_reflns         2116
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.026
_refine_ls_R_factor_all          0.0677
_refine_ls_R_factor_gt           0.0422
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0463P)^2^+0.9628P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0982
_refine_ls_wR_factor_ref         0.1099
_reflns_number_gt                1458
_reflns_number_total             2116
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4ra02714k2.cif
_cod_data_source_block           c2c
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2827 2014-09-09 07:05:25Z andrius 
;
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7218379