Organocatalytic Michael-Knoevenagel-hetero-Diels-Alder reactions: an efficient asymmetric one-pot strategy to isochromene pyrimidinedione derivatives.
Hong, Bor-Cherng; Dange, Nitin S.; Ding, Chun-Feng; Liao, Ju-Hsiou; Organic letters 14 (2012) 448–451; doi:10.1021/ol202877m

data_1503495
_publ_section_title
;
 Organocatalytic Michael-Knoevenagel-hetero-Diels-Alder reactions: an
 efficient asymmetric one-pot strategy to isochromene pyrimidinedione
 derivatives.
;
_journal_issue                   2
_journal_name_full               'Organic letters'
_journal_page_first              448
_journal_page_last               451
_journal_paper_doi               10.1021/ol202877m
_journal_volume                  14
_journal_year                    2012
_chemical_absolute_configuration ad
_chemical_formula_sum            'C25 H26 Br N3 O4'
_chemical_formula_weight         512.40
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_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_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.7843(7)
_cell_length_b                   21.111(3)
_cell_length_c                   21.215(3)
_cell_measurement_reflns_used    999
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      23.529
_cell_measurement_theta_min      -23.529
_cell_volume                     2590.6(6)
_computing_cell_refinement       'BRUKER SMART'
_computing_data_collection       'BRUKER SMART'
_computing_data_reduction        'BRUKER SAINT'
_computing_molecular_graphics    Ortep-3
_computing_publication_material  'Wingx publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker Smart Apex'
_diffrn_measurement_method       'phi-omega scan'
_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  0.0739
_diffrn_reflns_av_sigmaI/netI    0.0665
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            24665
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.36
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    1.620
_exptl_absorpt_correction_T_max  0.9761
_exptl_absorpt_correction_T_min  0.7570
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.314
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             1056
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.371
_refine_diff_density_min         -0.504
_refine_diff_density_rms         0.059
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.022(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.021
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     300
_refine_ls_number_reflns         4549
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.021
_refine_ls_R_factor_all          0.0863
_refine_ls_R_factor_gt           0.0526
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0788P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1334
_refine_ls_wR_factor_ref         0.1466
_reflns_number_gt                2937
_reflns_number_total             4549
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol202877m_si_004.cif
_cod_data_source_block           nsd0705
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Empirical'
changed to 'empirical' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        2590.7(5)
_cod_database_code               1503495