Catalytic Enantioselective Synthesis of a cis-β-Boronyl Cyclobutylcarboxyester Scaffold and Its Highly Diastereoselective Nickel/Photoredox Dual-Catalyzed Csp3–Csp2 Cross-Coupling to Access Elusive trans-β-Aryl/Heteroaryl Cyclobutylcarboxyesters
Nguyen, Kevin; Clement, Helen A.; Bernier, Louise; Coe, Jotham W.; Farrell, William; Helal, Christopher J.; Reese, Matthew R.; Sach, Neal W.; Lee, Jack C.; Hall, Dennis G.; ACS Catalysis  (2020) 404–413; doi:10.1021/acscatal.0c04520

data_4518343
_publ_section_title
;
 Catalytic Enantioselective Synthesis of a cis-\b-Boronyl
 Cyclobutylcarboxyester Scaffold and Its Highly Diastereoselective
 Nickel/Photoredox Dual-Catalyzed Csp3--Csp2 Cross-Coupling to Access
 Elusive trans-\b-Aryl/Heteroaryl Cyclobutylcarboxyesters
;
_journal_name_full               'ACS Catalysis'
_journal_page_first              404
_journal_page_last               413
_journal_paper_doi               10.1021/acscatal.0c04520
_journal_year                    2020
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C31 H35 B O5'
_chemical_formula_sum            'C31 H35 B O5'
_chemical_formula_weight         498.40
_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'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     dual
_audit_creation_method           SHELXL-2017/1
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.1022(9)
_cell_length_b                   11.2466(11)
_cell_length_c                   27.186(3)
_cell_measurement_reflns_used    8338
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      21.54
_cell_measurement_theta_min      2.35
_cell_volume                     2783.0(5)
_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-2017/1 (Sheldrick, 2017)'
_computing_structure_solution    'SHELXT-2014/5 (Sheldrick 2015)'
_diffrn_ambient_temperature      193(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0401
_diffrn_reflns_av_unetI/netI     0.0307
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            22619
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.414
_diffrn_reflns_theta_min         1.498
_exptl_absorpt_coefficient_mu    0.079
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.9246
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details
; 
 SADABS 2016/2: Krause, L., Herbst-Irmer, R., Sheldrick G.M. & Stalke D., 
 J. Appl. Cryst. 48 (2015) 3-10 
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.190
_exptl_crystal_description       fragment
_exptl_crystal_F_000             1064
_exptl_crystal_size_max          0.293
_exptl_crystal_size_mid          0.239
_exptl_crystal_size_min          0.200
_refine_diff_density_max         0.155
_refine_diff_density_min         -0.166
_refine_diff_density_rms         0.034
_refine_ls_abs_structure_details
; 
 Flack x determined using 1894 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   0.4(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     338
_refine_ls_number_reflns         5708
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0472
_refine_ls_R_factor_gt           0.0374
_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^)+(0.0501P)^2^+0.2850P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0907
_refine_ls_wR_factor_ref         0.0974
_reflns_Friedel_coverage         0.760
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.996
_reflns_number_gt                4872
_reflns_number_total             5708
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            cs0c04520_si_003.cif
_cod_data_source_block           dgh1912
_cod_database_code               4518343
_shelx_shelxl_version_number     2017/1
_shelx_estimated_absorpt_t_min   0.977
_shelx_estimated_absorpt_t_max   0.984
_shelx_res_checksum              295
_shelx_hkl_checksum              77051