An umpolung strategy for intermolecular [2 + 2 + 1] cycloaddition of aryl aldehydes and nitriles: a facile access to 2,4,5-trisubstituted oxazoles.
Basavaiah, Deevi; Golime, Gangadhararao; Banoth, Shivalal; Todeti, Saidulu; Chemical science 13 (2022) 8080–8087; doi:10.1039/d2sc00046f

data_1567100
_publ_section_title
;
 An umpolung strategy for intermolecular [2 + 2 + 1] cycloaddition of aryl
 aldehydes and nitriles: a facile access to 2,4,5-trisubstituted oxazoles.
;
_journal_issue                   27
_journal_name_full               'Chemical science'
_journal_page_first              8080
_journal_page_last               8087
_journal_paper_doi               10.1039/d2sc00046f
_journal_volume                  13
_journal_year                    2022
_chemical_formula_sum            'C17 H13 Cl N2 O'
_chemical_formula_weight         296.74
_chemical_name_systematic
; 
 '5-(4-chlorophenyl)-4-cyclopropyl-2-(pyridin-2-yl)oxazole' 
;
_space_group_IT_number           9
_space_group_name_Hall           'C -2yc'
_space_group_name_H-M_alt        'C 1 c 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'C 1 c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2021-09-15 deposited with the CCDC.	2022-06-10 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.891(13)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.7112(16)
_cell_length_b                   23.177(8)
_cell_length_c                   10.865(4)
_cell_measurement_reflns_used    8717
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      27.47
_cell_measurement_theta_min      2.57
_cell_volume                     1438.0(8)
_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, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_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  0.0768
_diffrn_reflns_av_sigmaI/netI    0.0602
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            12472
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.76
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.265
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.2593
_exptl_absorpt_correction_type   none
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1808 before and 0.1108 after correction. The Ratio of minimum to maximum transmission is 0.3478. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.371
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blocks
_exptl_crystal_F_000             616
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.349
_refine_diff_density_min         -0.415
_refine_diff_density_rms         0.097
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.12(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.094
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     190
_refine_ls_number_reflns         2422
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.094
_refine_ls_R_factor_all          0.0525
_refine_ls_R_factor_gt           0.0471
_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^)+(0.0740P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1145
_refine_ls_wR_factor_ref         0.1183
_reflns_number_gt                2173
_reflns_number_total             2422
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            d2sc00046f2.cif
_cod_data_source_block           compound-5afv
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Monoclinic' was changed to
'monoclinic' in accordance with the
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/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 7556 2019-12-06 15:28:31Z antanas 

 Adding full bibliography for 1567097--1567102.cif.
;
_cod_original_cell_volume        1438.1(8)
_cod_original_sg_symbol_H-M      Cc
_cod_database_code               1567100