NHC-catalyzed enantioselective synthesis of dihydropyran-4-carbonitriles bearing all-carbon quaternary centers
Wu, Qiuju; Li, Chengcheng; Wang, Weihong; Wang, Hongling; Pan, Dingwu; Zheng, Pengcheng; Organic Chemistry Frontiers 4 (2017) 2323–; doi:10.1039/C7QO00571G

data_1553843
_publ_section_title
;
 NHC-catalyzed enantioselective synthesis of dihydropyran-4-carbonitriles
 bearing all-carbon quaternary centers
;
_journal_issue                   12
_journal_name_full               'Organic Chemistry Frontiers'
_journal_page_first              2323
_journal_paper_doi               10.1039/C7QO00571G
_journal_volume                  4
_journal_year                    2017
_chemical_absolute_configuration R
_chemical_formula_moiety         'C16 H15 N O4'
_chemical_formula_sum            'C16 H15 N O4'
_chemical_formula_weight         285.29
_chemical_name_systematic        3a
_chemical_properties_physical    ', Moisture-sensitive'
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2017-07-02 deposited with the CCDC.
2017-08-24 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.9730(3)
_cell_length_b                   12.9128(5)
_cell_length_c                   14.3781(8)
_cell_measurement_reflns_used    1647
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      70.7850
_cell_measurement_theta_min      4.5700
_cell_volume                     1480.28(11)
_computing_cell_refinement       'Bruker FRAMBO'
_computing_data_collection       'Bruker FRAMBO'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0220
_diffrn_reflns_av_sigmaI/netI    0.0383
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            3269
_diffrn_reflns_theta_full        66.05
_diffrn_reflns_theta_max         66.05
_diffrn_reflns_theta_min         4.60
_exptl_absorpt_coefficient_mu    0.767
_exptl_absorpt_correction_T_max  0.9069
_exptl_absorpt_correction_T_min  0.7752
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.280
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             600
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.139
_refine_diff_density_min         -0.133
_refine_diff_density_rms         0.032
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.1(3)
_refine_ls_extinction_coef       0.056(2)
_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   1.033
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     193
_refine_ls_number_reflns         2197
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0445
_refine_ls_R_factor_gt           0.0406
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0578P)^2^+0.1128P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1060
_refine_ls_wR_factor_ref         0.1097
_reflns_number_gt                2023
_reflns_number_total             2197
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c7qo00571g2.cif
_cod_data_source_block           170617b
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Orthorhombic' was changed
to 'orthorhombic' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/RSC/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1553843