New facile enantio- and diastereo-selective syntheses of (-)-triptonide and (-)-triptolide.
Zhang, Hongrui; Li, Haifeng; Xue, Jijun; Chen, Rui; Li, Ying; Tang, Yu; Li, Chunxin; Organic & biomolecular chemistry 12 (2014) 732–736; doi:10.1039/c3ob42183j

data_7153601
_publ_section_title
;
 New facile enantio- and diastereo-selective syntheses of (-)-triptonide
 and (-)-triptolide.
;
_journal_issue                   5
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              732
_journal_page_last               736
_journal_paper_doi               10.1039/c3ob42183j
_journal_volume                  12
_journal_year                    2014
_chemical_formula_sum            'C17 H14 O4'
_chemical_formula_weight         282.28
_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                   8.850(3)
_cell_length_b                   12.001(4)
_cell_length_c                   12.727(4)
_cell_measurement_reflns_used    1169
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      20.79
_cell_measurement_theta_min      2.33
_cell_volume                     1351.7(8)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0617
_diffrn_reflns_av_sigmaI/netI    0.0690
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            4965
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.33
_exptl_absorpt_coefficient_mu    0.099
_exptl_absorpt_correction_T_max  0.9700
_exptl_absorpt_correction_T_min  0.9662
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.387
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             592
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.31
_refine_diff_density_max         0.183
_refine_diff_density_min         -0.168
_refine_diff_density_rms         0.055
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   2.8(19)
_refine_ls_extinction_coef       0.028(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.977
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     193
_refine_ls_number_reflns         2483
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.977
_refine_ls_R_factor_all          0.0703
_refine_ls_R_factor_gt           0.0488
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0693P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1148
_refine_ls_wR_factor_ref         0.1309
_reflns_number_gt                1817
_reflns_number_total             2483
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3ob42183j.txt
_cod_data_source_block           p212121
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/usr/data/users/saulius/automatic-downloads/current/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_cell_volume        1351.8(8)
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               7153601