Total Syntheses of ent-Heliespirones A and C
Wen-Ju Bai; Jason C. Green; Thomas R. R. Pettus; Journal of Organic Chemistry 77 (2012) 379–387; doi:10.1021/jo201971g

data_4026849
_publ_section_title
;
 Total Syntheses of ent-Heliespirones A and C
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              379
_journal_page_last               387
_journal_paper_doi               10.1021/jo201971g
_journal_volume                  77
_journal_year                    2012
_chemical_absolute_configuration ad
_chemical_formula_sum            'C27 H29 N O9 S2'
_chemical_formula_weight         575.63
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.0911(8)
_cell_length_b                   10.8032(12)
_cell_length_c                   34.798(5)
_cell_measurement_temperature    100(2)
_cell_volume                     2665.8(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker Kappa Apex II'
_diffrn_measurement_method       'omega scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0326
_diffrn_reflns_av_sigmaI/netI    0.0418
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       38
_diffrn_reflns_limit_l_min       -46
_diffrn_reflns_number            15906
_diffrn_reflns_theta_full        28.30
_diffrn_reflns_theta_max         28.30
_diffrn_reflns_theta_min         1.97
_exptl_absorpt_coefficient_mu    0.256
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.6714
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.434
_exptl_crystal_description       plate
_exptl_crystal_F_000             1208
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.328
_refine_diff_density_min         -0.285
_refine_diff_density_rms         0.058
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.04(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.090
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     355
_refine_ls_number_reflns         6598
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.090
_refine_ls_R_factor_all          0.0380
_refine_ls_R_factor_gt           0.0363
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0397P)^2^+1.0158P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0911
_refine_ls_wR_factor_ref         0.0920
_reflns_number_gt                6376
_reflns_number_total             6598
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo201971g_si_002.cif
_cod_data_source_block           p08082011_0m
_cod_database_code               4026849