Diastereoselective photodimerization reactions of chromone-2-carboxamides to construct a C2-chiral scaffold.
Yagishita, Fumitoshi; Baba, Nozomi; Ueda, Yuki; Katabira, Satoshi; Kasashima, Yoshio; Mino, Takashi; Sakamoto, Masami; Organic & biomolecular chemistry 12 (2014) 9644–9649; doi:10.1039/c4ob01827c

data_7154127
_publ_section_title
;
 Diastereoselective photodimerization reactions of chromone-2-carboxamides
 to construct a C2-chiral scaffold.
;
_journal_issue                   47
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              9644
_journal_page_last               9649
_journal_paper_doi               10.1039/c4ob01827c
_journal_volume                  12
_journal_year                    2014
_chemical_absolute_configuration syn
_chemical_formula_sum            'C16 H19 N O3'
_chemical_formula_weight         273.32
_chemical_melting_point          359.5(5)
_chemical_name_systematic        (R)-N-(1-t-Butylethyl)-2-chromonecarboxamide
_space_group_crystal_system      triclinic
_space_group_IT_number           1
_space_group_name_Hall           'P 1'
_space_group_name_H-M_alt        'P 1'
_symmetry_space_group_name_Hall  'P 1'
_symmetry_space_group_name_H-M   'P 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     'SHELXT(George Sheldrick, 2012)'
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                64.4240(19)
_cell_angle_beta                 82.5940(19)
_cell_angle_gamma                89.9950(19)
_cell_formula_units_Z            2
_cell_length_a                   5.9167(9)
_cell_length_b                   10.9747(17)
_cell_length_c                   12.2265(18)
_cell_measurement_reflns_used    1299
_cell_measurement_temperature    173
_cell_measurement_theta_max      27.0350
_cell_measurement_theta_min      3.3295
_cell_volume                     708.78(19)
_computing_cell_refinement       'SAINT V8.32B (Bruker AXS Inc., 2013)'
_computing_data_reduction        'SAINT V8.32B (Bruker AXS Inc., 2013)'
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_diffrn_ambient_temperature      173
_diffrn_detector_area_resol_mean 8.3333
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.974
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  'graphite '
_diffrn_radiation_type           'MoK\a '
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0147
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            3806
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         2.06
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  0.98
_exptl_absorpt_correction_T_min  0.92
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS V2012/1 (Bruker AXS Inc.)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.281
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             292
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: CHCl3/hexane'
_exptl_crystal_size_max          0.300
_exptl_crystal_size_mid          0.300
_exptl_crystal_size_min          0.200
_refine_diff_density_max         0.166
_refine_diff_density_min         -0.234
_refine_ls_abs_structure_details
;
Flack x determined using 366 quotients [(I+)-(I-)]/[(I+)+(I-)]
(Parsons and Flack (2004), Acta Cryst. A60, s61).
;
_refine_ls_abs_structure_Flack   -0.7(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.042
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     369
_refine_ls_number_reflns         3228
_refine_ls_number_restraints     107
_refine_ls_restrained_S_all      1.024
_refine_ls_R_factor_all          0.0441
_refine_ls_R_factor_gt           0.0398
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0635P)^2^+0.0180P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1003
_refine_ls_wR_factor_ref         0.1043
_reflns_number_gt                2931
_reflns_number_total             3228
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c4ob01827c2.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '359-360' was changed to '359.5(5)' -
the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 2827 2014-09-09 07:05:25Z andrius 

 Adding full bibliography for 7154126--7154132.cif.
;
_cod_database_code               7154127
_shelx_res_checksum              29406
_shelx_hkl_checksum              63551