Unified Synthesis of Right Halves of Halichondrins A-C.
Yahata, Kenzo; Ye, Ning; Iso, Kentaro; Naini, Santhosh Reddy; Yamashita, Shuji; Ai, Yanran; Kishi, Yoshito; The Journal of organic chemistry 82 (2017) 8792–8807; doi:10.1021/acs.joc.7b01283

data_4032696
_publ_section_title
;
 Unified Synthesis of Right Halves of Halichondrins A-C.
;
_journal_issue                   17
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              8792
_journal_page_last               8807
_journal_paper_doi               10.1021/acs.joc.7b01283
_journal_volume                  82
_journal_year                    2017
_chemical_absolute_configuration ad
_chemical_formula_sum            'C41 H58 O13'
_chemical_formula_weight         758.87
_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'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.03010(10)
_cell_length_b                   17.6976(3)
_cell_length_c                   19.2949(3)
_cell_measurement_reflns_used    9472
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      66.5
_cell_measurement_theta_min      2.45
_cell_volume                     3766.49(9)
_computing_cell_refinement       'SAINT 8.37A (Bruker-AXS, 2015)'
_computing_data_collection       'APEX3 v2016.1-0 (Bruker-AXS, 2016)'
_computing_data_reduction        'SAINT 8.37A (Bruker-AXS, 2015)'
_computing_molecular_graphics    'Bruker SHELXTL (Sheldrick, 2015)'
_computing_publication_material  'Bruker SHELXTL (Sheldrick, 2015)'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT-2014 (Sheldrick, 2015)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type
;
Bruker D8 goniometer with CCD area detector  
;
_diffrn_measurement_method       'omega and phi scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'I\mS microfocus tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0598
_diffrn_reflns_av_unetI/netI     0.0223
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            93516
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        66.500
_diffrn_reflns_theta_max         66.747
_diffrn_reflns_theta_min         3.389
_exptl_absorpt_coefficient_mu    0.815
_exptl_absorpt_correction_T_max  0.8637
_exptl_absorpt_correction_T_min  0.8148
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.338
_exptl_crystal_description       block
_exptl_crystal_F_000             1632
_exptl_crystal_size_max          0.180
_exptl_crystal_size_mid          0.140
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.253
_refine_diff_density_min         -0.219
_refine_diff_density_rms         0.040
_refine_ls_abs_structure_details
;
 Flack x determined using 2724 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.14(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     496
_refine_ls_number_reflns         6651
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.039
_refine_ls_R_factor_all          0.0396
_refine_ls_R_factor_gt           0.0384
_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^)+(0.0515P)^2^+2.1418P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1012
_refine_ls_wR_factor_ref         0.1018
_reflns_Friedel_coverage         0.784
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.998
_reflns_number_gt                6432
_reflns_number_total             6651
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo7b01283_si_002.cif
_cod_data_source_block           yk076
_cod_database_code               4032696
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.867
_shelx_estimated_absorpt_t_max   0.923
_shelx_res_checksum              43005
_shelx_hkl_checksum              50970