Azomethine Ylide Cycloaddition Approach toward Dendrobine: Synthesis of 5-Deoxymubironine C.
Williams, Benjamin M.; Trauner, Dirk; The Journal of organic chemistry 83 (2018) 3061–3068; doi:10.1021/acs.joc.8b00192

data_4035171
_publ_section_title
;
 Azomethine Ylide Cycloaddition Approach toward Dendrobine: Synthesis of
 5-Deoxymubironine C.
;
_journal_issue                   6
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              3061
_journal_page_last               3068
_journal_paper_doi               10.1021/acs.joc.8b00192
_journal_volume                  83
_journal_year                    2018
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C16 H26 O4'
_chemical_formula_sum            'C16 H26 O4'
_chemical_formula_weight         282.37
_chemical_name_common            673
_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
_audit_block_code                C16H26O4_vv246_trauner
_audit_creation_method           'APEX3 v2016.5-0'
_audit_update_record             06-Apr-17
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   10.3207(2)
_cell_length_b                   13.0112(3)
_cell_length_c                   24.0063(6)
_cell_measurement_reflns_used    9979
_cell_measurement_temperature    100.(2)
_cell_measurement_theta_max      33.9153
_cell_measurement_theta_min      2.5189
_cell_volume                     3223.68(13)
_computing_cell_refinement       'SAINT V8.37A (Bruker AXS Inc., 2015)'
_computing_data_collection       'APEX3 v2016.5-0, Bruker AXS (2016)'
_computing_data_reduction        'SAINT V8.37A (Bruker AXS Inc., 2015)'
_computing_molecular_graphics    'shelXle (C.B. Huebschle, rev 786)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'XT, VERSION 2014/5'
_diffrn_ambient_temperature      100.(2)
_diffrn_detector_area_resol_mean 7.4074
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device       'fixed-chi three-circle diffractometer'
_diffrn_measurement_device_type  'Bruker D8 Venture TXS'
_diffrn_measurement_method       'mix of phi and omega scans'
_diffrn_radiation_monochromator  'focusing mirrors'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0268
_diffrn_reflns_av_unetI/netI     0.0291
_diffrn_reflns_Laue_measured_fraction_full 0.996
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            19336
_diffrn_reflns_point_group_measured_fraction_full 0.996
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.372
_diffrn_reflns_theta_min         3.221
_diffrn_source                   'rotating anode (TXS)'
_diffrn_source_current           50
_diffrn_source_power             2.5
_diffrn_source_type              'Bruker TXS'
_diffrn_source_voltage           50
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  0.9705
_exptl_absorpt_correction_T_min  0.9221
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 - Bruker AXS area detector scaling and absorption correction
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.164
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1232
_exptl_crystal_size_max          0.100
_exptl_crystal_size_mid          0.080
_exptl_crystal_size_min          0.050
_refine_diff_density_max         0.441
_refine_diff_density_min         -0.278
_refine_diff_density_rms         0.041
_refine_ls_abs_structure_details
;

Flack x determined using 2482 quotients [(I+)-(I-)]/[(I+)+(I-)]
(Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.1(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.040
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     392
_refine_ls_number_reflns         6566
_refine_ls_number_restraints     19
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0436
_refine_ls_R_factor_gt           0.0398
_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^)+(0.0562P)^2^+0.9609P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1032
_refine_ls_wR_factor_ref         0.1057
_reflns_Friedel_coverage         0.779
_reflns_Friedel_fraction_full    0.997
_reflns_Friedel_fraction_max     0.998
_reflns_number_gt                6102
_reflns_number_total             6566
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo8b00192_si_002.cif
_cod_data_source_block           vv246
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_absorpt_correction_type' value 'Multi-Scan' was
changed to 'multi-scan' 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_database_code               4035171
_shelx_estimated_absorpt_t_min   0.992
_shelx_estimated_absorpt_t_max   0.996
_shelx_res_checksum              21333
_shelx_hkl_checksum              33213