An asymmetric vinylogous Mukaiyama-Michael reaction of α,β-unsaturated 2-acyl imidazoles catalyzed by chiral Sc(iii)- or Er(iii)-pybox complexes.
Rout, Subhrajit; Das, Arko; Singh, Vinod K.; Chemical communications (Cambridge, England) 53 (2017) 5143–5146; doi:10.1039/c7cc01763d

data_7119964
_publ_section_title
;
 An asymmetric vinylogous Mukaiyama-Michael reaction of \a,\b-unsaturated
 2-acyl imidazoles catalyzed by chiral Sc(iii)- or Er(iii)-pybox
 complexes.
;
_journal_issue                   37
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              5143
_journal_page_last               5146
_journal_paper_doi               10.1039/c7cc01763d
_journal_volume                  53
_journal_year                    2017
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C18 H17 Cl N2 O3'
_chemical_formula_sum            'C18 H17 Cl N2 O3'
_chemical_formula_weight         344.79
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2017-01-09
_audit_creation_method
;
Olex2 1.2
(compiled 2017.01.04 svn.r3372 for OlexSys, GUI svn.r5289)
;
_audit_update_record
;
2017-01-10 deposited with the CCDC.
2017-04-12 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.8555(4)
_cell_length_b                   12.1442(5)
_cell_length_c                   12.5528(5)
_cell_measurement_reflns_used    9886
_cell_measurement_temperature    100
_cell_measurement_theta_max      28.26
_cell_measurement_theta_min      2.48
_cell_volume                     1654.85(11)
_computing_cell_refinement       'SAINT v8.34A (Bruker, 2013)'
_computing_data_reduction        'SAINT v8.34A (Bruker, 2013)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      100
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0462
_diffrn_reflns_av_unetI/netI     0.0319
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            25291
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.314
_diffrn_reflns_theta_min         2.480
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.250
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.6365
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details
;
SADABS-2014/4 (Bruker,2014/4) was used for absorption correction.
wR2(int) was 0.1349 before and 0.0500 after correction.
The Ratio of minimum to maximum transmission is 0.8536.
The \l/2 correction factor is 0.00150.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.384
_exptl_crystal_description       block
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.02
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.235
_refine_diff_density_min         -0.224
_refine_diff_density_rms         0.052
_refine_ls_abs_structure_details
;
 Flack x determined using 1481 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.00(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     219
_refine_ls_number_reflns         4126
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0415
_refine_ls_R_factor_gt           0.0349
_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^)+(0.0380P)^2^+0.3878P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0765
_refine_ls_wR_factor_ref         0.0789
_reflns_Friedel_coverage         0.758
_reflns_Friedel_fraction_full    0.999
_reflns_Friedel_fraction_max     0.999
_reflns_number_gt                3734
_reflns_number_total             4126
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7cc01763d2.cif
_cod_data_source_block           5q
_cod_depositor_comments
'Adding full bibliography for 7119962--7119964.cif.'
_cod_database_code               7119964
_shelx_shelxl_version_number     2016/4
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C7(H7)
2.b Secondary CH2 refined with riding coordinates:
 C6(H6A,H6B)
2.c Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C8(H8), C16(H16), C11(H11), C15(H15), C9(H9), C10(H10)
2.d Idealised Me refined as rotating group:
 C1(H1A,H1B,H1C), C18(H18A,H18B,H18C)
;
_olex2_submission_special_instructions 'No special instructions were received'