Asymmetric Synthesis of Azepine-Fused Cyclobutanes from Yne-Methylenecyclopropanes Involving Cyclopropanation/C-C Cleavage/Wagner-Meerwein Rearrangement and Reaction Mechanism.
Li, Chen-Long; Yu, Zhi-Xiang; The Journal of organic chemistry 84 (2019) 9913–9928; doi:10.1021/acs.joc.9b01071

data_4034024
_publ_section_title
;
 Asymmetric Synthesis of Azepine-Fused Cyclobutanes from
 Yne-Methylenecyclopropanes Involving Cyclopropanation/C-C
 Cleavage/Wagner-Meerwein Rearrangement and Reaction Mechanism.
;
_journal_issue                   16
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              9913
_journal_page_last               9928
_journal_paper_doi               10.1021/acs.joc.9b01071
_journal_volume                  84
_journal_year                    2019
_chemical_absolute_configuration ad
_chemical_formula_sum            'C27 H24 Br N O2 S'
_chemical_formula_weight         506.44
_space_group_crystal_system      orthorhombic
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_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
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_cell_angle_beta                 90
_cell_angle_gamma                90
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_cell_length_a                   7.05990(10)
_cell_length_b                   15.7538(2)
_cell_length_c                   20.8421(3)
_cell_measurement_reflns_used    27382
_cell_measurement_temperature    180.00(10)
_cell_measurement_theta_max      28.7820
_cell_measurement_theta_min      2.3530
_cell_volume                     2318.06(6)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      180.00(10)
_diffrn_detector                 'CCD plate'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'XtaLAB AFC12 (RINC): Kappa single'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0287
_diffrn_reflns_av_unetI/netI     0.0136
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            53482
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.483
_diffrn_reflns_theta_min         2.343
_diffrn_source                   'fine-focus sealed X-ray tube'
_diffrn_source_type              'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    1.888
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.75610
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.39.29a (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.451
_exptl_crystal_description       rod-like
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_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.771
_refine_diff_density_min         -0.609
_refine_diff_density_rms         0.042
_refine_ls_abs_structure_details
;
 Flack x determined using 2075 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.0053(16)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     290
_refine_ls_number_reflns         5320
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0273
_refine_ls_R_factor_gt           0.0253
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0384P)^2^+0.7114P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0659
_refine_ls_wR_factor_ref         0.0669
_reflns_Friedel_coverage         0.754
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                5073
_reflns_number_total             5320
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo9b01071_si_003.cif
_cod_data_source_block           3
_cod_database_code               4034024
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              47376
_shelx_hkl_checksum              78834