N-B dative bond-induced [3.3.0] bicyclic boronate-tethered exo-selective intramolecular Diels-Alder reaction.
Feng, Chao; Wang, Hong; Xu, Liang; Li, Pengfei; Organic & biomolecular chemistry 13 (2015) 7136–7139; doi:10.1039/c5ob00917k

data_7154508
_publ_section_title
;
 N-B dative bond-induced [3.3.0] bicyclic boronate-tethered exo-selective
 intramolecular Diels-Alder reaction.
;
_journal_issue                   26
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              7136
_journal_page_last               7139
_journal_paper_doi               10.1039/c5ob00917k
_journal_volume                  13
_journal_year                    2015
_chemical_formula_sum            'C18 H20 B N O4'
_chemical_formula_weight         325.16
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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
;
2015-05-04 deposited with the CCDC.
2015-05-20 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 112.161(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.048(2)
_cell_length_b                   10.7891(19)
_cell_length_c                   12.787(2)
_cell_measurement_temperature    293(2)
_cell_volume                     1667.1(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_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  0.0469
_diffrn_reflns_av_sigmaI/netI    0.0480
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            9639
_diffrn_reflns_theta_full        24.92
_diffrn_reflns_theta_max         24.92
_diffrn_reflns_theta_min         1.69
_exptl_absorpt_coefficient_mu    0.090
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.296
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             688
_refine_diff_density_max         0.235
_refine_diff_density_min         -0.255
_refine_diff_density_rms         0.057
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.098
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     359
_refine_ls_number_reflns         2885
_refine_ls_number_restraints     381
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0740
_refine_ls_R_factor_gt           0.0634
_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^)+(0.0317P)^2^+2.2361P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1492
_refine_ls_wR_factor_ref         0.1547
_reflns_number_gt                2435
_reflns_number_total             2885
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c5ob00917k2.cif
_cod_data_source_block           1
_cod_depositor_comments
'Adding full bibliography for 7154507--7154508.cif.'
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7154508