Application of Electrocyclic Ring-Opening and Desymmetrizing Nucleophilic Trappings of meso-6,6-Dibromobicyclo[3.1.0]hexanes to Total Syntheses of Crinine and Haemanthamine Alkaloids.
Lan, Ping; Banwell, Martin G.; Willis, Anthony C.; The Journal of organic chemistry 84 (2019) 3431–3466; doi:10.1021/acs.joc.9b00018

data_4033910
_publ_section_title
;
 Application of Electrocyclic Ring-Opening and Desymmetrizing Nucleophilic
 Trappings of meso-6,6-Dibromobicyclo[3.1.0]hexanes to Total Syntheses of
 Crinine and Haemanthamine Alkaloids.
;
_journal_issue                   6
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              3431
_journal_page_last               3466
_journal_paper_doi               10.1021/acs.joc.9b00018
_journal_volume                  84
_journal_year                    2019
_chemical_absolute_configuration ad
_chemical_compound_source        local
_chemical_formula_moiety         'C21 H32 Br N O Si'
_chemical_formula_sum            'C21 H32 Br N O Si'
_chemical_formula_weight         422.48
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             12-04-02
_audit_creation_method           CRYSTALS_ver_14.11
_audit_update_record
;
2012-04-03 - Report on C21 H32 Br N O Si
            by Anthony C. Willis
            for  Ping Lan and Martin Banwell

2012-04-03 - passes checkcif tests with few warnings

;
_cell_angle_alpha                90
_cell_angle_beta                 90.4980(7)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.8031(2)
_cell_length_b                   7.9845(1)
_cell_length_c                   25.7942(4)
_cell_measurement_reflns_used    53807
_cell_measurement_temperature    200
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      3
_cell_volume                     2224.86(6)
_computing_cell_refinement       'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 2001).'
_computing_data_reduction        'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_molecular_graphics
; 
ORTEP-II (Johnson 1976) in teXsan (MSC, 1992-1997)
;
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      200
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device       Area
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       ' \f and \w scans with CCD '
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.066
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            43637
_diffrn_reflns_theta_full        27.491
_diffrn_reflns_theta_max         27.491
_diffrn_reflns_theta_min         2.670
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.910
_exptl_absorpt_correction_T_max  0.891
_exptl_absorpt_correction_T_min  0.646
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details
;
via Gaussian method (Coppens, 1970) implemented in maXus (2000)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.261
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             888
_exptl_crystal_size_max          0.380
_exptl_crystal_size_mid          0.140
_exptl_crystal_size_min          0.060
_refine_diff_density_max         1.44
_refine_diff_density_min         -0.93
_refine_ls_abs_structure_details 'Flack (1983), 4729 Friedel-pairs'
_refine_ls_abs_structure_Flack   -0.014(4)
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   0.9702
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     458
_refine_ls_number_reflns         10190
_refine_ls_number_restraints     1
_refine_ls_R_factor_all          0.0571
_refine_ls_R_factor_gt           0.0367
_refine_ls_shift/su_max          0.0262813
_refine_ls_shift/su_mean         0.0016713
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 Method= Modified Sheldrick 
 w=1/[\s^2^(F^2^) + ( 0.03P)^2^ + 0.63P] 
 ,where P=(max(Fo^2^,0) + 2Fc^2^)/3 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0678
_refine_ls_wR_factor_gt          0.0626
_refine_ls_wR_factor_ref         0.0678
_reflns_limit_h_max              14
_reflns_limit_h_min              -14
_reflns_limit_k_max              10
_reflns_limit_k_min              -10
_reflns_limit_l_max              33
_reflns_limit_l_min              0
_reflns_number_gt                7942
_reflns_number_total             10191
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   3.57
_oxford_diffrn_Wilson_scale      10.24
_oxford_refine_ls_r_factor_ref   0.0571
_oxford_refine_ls_scale          0.36184(18)
_oxford_reflns_number_all        10190
_oxford_reflns_threshold_expression_ref I>-10.0\s(I)
_oxford_structure_analysis_title '4021644 ban1207'
_cod_data_source_file            jo9b00018_si_011.cif
_cod_data_source_block           ban1207
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Monoclinic' was changed to
'monoclinic' in accordance with the
/home/data/users/saulius/crontab/automatic-downloads/current/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_H-M      'P 1 21 1 '
_cod_database_code               4033910
_iucr_refine_instruction_details_constraints
;
BLOCK SCALE X'S, U'S 
CONT H(151,X'S) H(451,X'S) 
CONT ENANTIO 
RIDE C   (   2,X'S) H   (  21,X'S) 
RIDE C   (   3,X'S) H   (  31,X'S) H   (  32,X'S) 
RIDE C   (   4,X'S) H   (  41,X'S) 
RIDE C   (   7,X'S) H   (  71,X'S) H   (  72,X'S) H   (  73,X'S) 
RIDE C   (   8,X'S) H   (  81,X'S) H   (  82,X'S) H   (  83,X'S) 
RIDE C   (  10,X'S) H   ( 101,X'S) H   ( 102,X'S) H   ( 103,X'S) 
RIDE C   (  11,X'S) H   ( 111,X'S) H   ( 112,X'S) H   ( 113,X'S) 
RIDE C   (  12,X'S) H   ( 121,X'S) H   ( 122,X'S) H   ( 123,X'S) 
RIDE C   (  13,X'S) H   ( 131,X'S) H   ( 132,X'S) 
RIDE C   (  14,X'S) H   ( 141,X'S) 
RIDE C   (  16,X'S) H   ( 161,X'S) 
RIDE C   (  17,X'S) H   ( 171,X'S) H   ( 172,X'S) 
RIDE C   (  18,X'S) H   ( 181,X'S) H   ( 182,X'S) 
RIDE C   (  20,X'S) H   ( 201,X'S) 
RIDE C   (  21,X'S) H   ( 211,X'S) 
RIDE C   (  22,X'S) H   ( 221,X'S) 
RIDE C   (  23,X'S) H   ( 231,X'S) 
RIDE C   (  32,X'S) H   ( 321,X'S) 
RIDE C   (  33,X'S) H   ( 331,X'S) H   ( 332,X'S) 
RIDE C   (  34,X'S) H   ( 341,X'S) 
RIDE C   (  37,X'S) H   ( 371,X'S) H   ( 372,X'S) H   ( 373,X'S) 
RIDE C   (  38,X'S) H   ( 381,X'S) H   ( 382,X'S) H   ( 383,X'S) 
RIDE C   (  40,X'S) H   ( 401,X'S) H   ( 402,X'S) H   ( 403,X'S) 
RIDE C   (  41,X'S) H   ( 411,X'S) H   ( 412,X'S) H   ( 413,X'S) 
RIDE C   (  42,X'S) H   ( 421,X'S) H   ( 422,X'S) H   ( 423,X'S) 
RIDE C   (  43,X'S) H   ( 431,X'S) H   ( 432,X'S) 
RIDE C   (  44,X'S) H   ( 441,X'S) 
RIDE C   (  46,X'S) H   ( 461,X'S) 
RIDE C   (  47,X'S) H   ( 471,X'S) H   ( 472,X'S) 
RIDE C   (  48,X'S) H   ( 481,X'S) H   ( 482,X'S) 
RIDE C   (  50,X'S) H   ( 501,X'S) 
RIDE C   (  51,X'S) H   ( 511,X'S) 
RIDE C   (  52,X'S) H   ( 521,X'S) 
RIDE C   (  53,X'S) H   ( 531,X'S) 
END                                                                             
;
_iucr_refine_instruction_details_restraints
;
NO 
REM   HREST   START (DO NOT REMOVE THIS LINE) 
REM   HREST   END (DO NOT REMOVE THIS LINE) 
END                                                                             
;