N-Heterocyclic Carbene Catalyzed [4 + 2] Annulation Reactions with in Situ Generated Heterocyclic ortho-Quinodimethanes.
Xu, Jianfeng; Yuan, Shiru; Miao, Maozhong; Organic letters 18 (2016) 3822–3825; doi:10.1021/acs.orglett.6b01831

data_1543630
_publ_section_title
;
 N-Heterocyclic Carbene Catalyzed [4 + 2] Annulation Reactions with in
 Situ Generated Heterocyclic ortho-Quinodimethanes.
;
_journal_issue                   15
_journal_name_full               'Organic letters'
_journal_page_first              3822
_journal_page_last               3825
_journal_paper_doi               10.1021/acs.orglett.6b01831
_journal_volume                  18
_journal_year                    2016
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C47 H42 Br N3 O6'
_chemical_formula_sum            'C47 H42 Br N3 O6'
_chemical_formula_weight         824.75
_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     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2016-03-11
_audit_creation_method
;
Olex2 1.2
(compiled 2014.03.20 svn.r2914 for OlexSys, GUI svn.r4816)
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.3087(6)
_cell_length_b                   15.2260(8)
_cell_length_c                   18.5087(9)
_cell_measurement_reflns_used    7597
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      29.5266
_cell_measurement_theta_min      2.8873
_cell_volume                     4032.4(3)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
;
_computing_data_collection
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CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
;
_computing_data_reduction
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CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
;
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      293.15
_diffrn_detector_area_resol_mean 10.3592
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Xcalibur, Atlas, Gemini ultra'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_UB_11      0.0076612000
_diffrn_orient_matrix_UB_12      -0.0004258000
_diffrn_orient_matrix_UB_13      0.0378530000
_diffrn_orient_matrix_UB_21      0.0176104000
_diffrn_orient_matrix_UB_22      0.0435146000
_diffrn_orient_matrix_UB_23      -0.0018321000
_diffrn_orient_matrix_UB_31      -0.0456722000
_diffrn_orient_matrix_UB_32      0.0167202000
_diffrn_orient_matrix_UB_33      0.0056449000
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0492
_diffrn_reflns_av_unetI/netI     0.0469
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            26513
_diffrn_reflns_theta_full        25.35
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         2.89
_diffrn_source                   'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    1.073
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.93072
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
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CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'light yellow'
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.359
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1712
_exptl_crystal_size_max          0.29
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.23
_refine_diff_density_max         0.222
_refine_diff_density_min         -0.301
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details 'Flack (1983), 3268 Friedel pairs'
_refine_ls_abs_structure_Flack   -0.017(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     520
_refine_ls_number_reflns         7367
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0560
_refine_ls_R_factor_gt           0.0382
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0326P)^2^+0.3963P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0749
_refine_ls_wR_factor_ref         0.0823
_reflns_number_gt                5977
_reflns_number_total             7367
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol6b01831_si_002.cif
_cod_data_source_block           160310
_cod_depositor_comments          'Adding full bibliography for 1543630.cif.'
_cod_database_code               1543630
_chemical_oxdiff_formula         'c10 h10 n2 o2 Br1'
_reflns_odcompleteness_completeness 99.65
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     26.32
_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 Secondary CH2 refined with riding coordinates:
 C9(H9A,H9B)
2.b Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C5(H5), C14(H14), C15(H15), C16(H16), C17(H17), C21(H21),
 C22(H22), C23(H23), C24(H24), C25(H25), C27(H27), C28(H28), C29(H29), C30(H30),
  C31(H31), C33(H33), C34(H34), C35(H35), C36(H36), C37(H37)
2.c Idealised Me refined as rotating group:
 C40(H40A,H40B,H40C), C41(H41A,H41B,H41C), C42(H42A,H42B,H42C), C45(H45A,H45B,
 H45C), C46(H46A,H46B,H46C), C47(H47A,H47B,H47C)
;