Development of a Modular Synthetic Route to (+)-Pleuromutilin, (+)-12-epi-Mutilins, and Related Structures.
Zeng, Mingshuo; Murphy, Stephen K.; Herzon, Seth B.; Journal of the American Chemical Society 139 (2017) 16377–16388; doi:10.1021/jacs.7b09869

data_4131744
_publ_section_title
;
 Development of a Modular Synthetic Route to (+)-Pleuromutilin,
 (+)-12-epi-Mutilins, and Related Structures.
;
_journal_issue                   45
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              16377
_journal_page_last               16388
_journal_paper_doi               10.1021/jacs.7b09869
_journal_volume                  139
_journal_year                    2017
_chemical_absolute_configuration ad
_chemical_formula_sum            'C26 H42 O3 Si'
_chemical_formula_weight         430.68
_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   geom
_atom_sites_solution_primary     SHELXT
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            24
_cell_length_a                   17.4551(2)
_cell_length_b                   25.0058(3)
_cell_length_c                   33.3734(3)
_cell_measurement_reflns_used    148880
_cell_measurement_temperature    93(2)
_cell_measurement_theta_max      66.6250
_cell_measurement_theta_min      2.6370
_cell_volume                     14566.8(3)
_computing_cell_refinement       'CrysAlisPro 1.171.39.16b (Rigaku OD, 2015)'
_computing_data_collection       'CrysAlisPro 1.171.39.16b (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.39.16b (Rigaku OD, 2015)'
_computing_molecular_graphics
; 
Dolomanov, O.V.; Bourhis, L.J.; Gildea, R.J.; Howard, J.A.K.; Puschmann, H., 
OLEX2: A complete structure solution, refinement and analysis program 
(2009). J. Appl. Cryst., 42, 339-341. 
;
_computing_publication_material  'CIFTAB-2014/2 (Sheldrick, 2014)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXT-2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      93(2)
_diffrn_detector_area_resol_mean 22.2
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Rigaku Saturn 944+ CCD'
_diffrn_measurement_method       \w
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.1155
_diffrn_reflns_av_unetI/netI     0.0312
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       29
_diffrn_reflns_limit_k_min       -29
_diffrn_reflns_limit_l_max       39
_diffrn_reflns_limit_l_min       -39
_diffrn_reflns_number            522510
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        66.774
_diffrn_reflns_theta_max         66.774
_diffrn_reflns_theta_min         2.208
_diffrn_source                   'microfocus rotating anode'
_exptl_absorpt_coefficient_mu    1.029
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.47221
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
CrysAlisPro 1.171.39.16b (Rigaku Oxford Diffraction, 2015) 
Empirical absorption correction using spherical harmonics, 
 implemented in SCALE3 ABSPACK scaling algorithm. 
;
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.178
_exptl_crystal_description       Needle
_exptl_crystal_F_000             5664
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.080
_exptl_crystal_size_min          0.020
_refine_diff_density_max         0.464
_refine_diff_density_min         -0.338
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details
; 
 Flack x determined using 10887 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   -0.001(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.016
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1693
_refine_ls_number_reflns         25802
_refine_ls_number_restraints     45
_refine_ls_restrained_S_all      1.017
_refine_ls_R_factor_all          0.0389
_refine_ls_R_factor_gt           0.0364
_refine_ls_shift/su_max          0.001
_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^+4.8650P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0894
_refine_ls_wR_factor_ref         0.0912
_reflns_Friedel_coverage         0.854
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.998
_reflns_number_gt                24676
_reflns_number_total             25802
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b09869_si_003.cif
_cod_data_source_block           007b-17048
_cod_database_code               4131744
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.821
_shelx_estimated_absorpt_t_max   0.980
_shelx_res_checksum              40005
_shelx_hkl_checksum              49789