One-step semisynthesis method of spirocurcasone and pyracurcasone from curcusones a and B.
Li, Xu-Yang; Yang, Yuan-Feng; Peng, Xing-Rong; Li, Ming-Ming; Li, Liang-Qun; Deng, Xu; Qin, Hong-Bo; Liu, Jie-Qing; Qiu, Ming-Hua; Organic letters 16 (2014) 2196–2199; doi:10.1021/ol500692j

data_1514223
_publ_section_title
;
 One-step semisynthesis method of spirocurcasone and pyracurcasone from
 curcusones a and B.
;
_journal_issue                   8
_journal_name_full               'Organic letters'
_journal_page_first              2196
_journal_page_last               2199
_journal_paper_doi               10.1021/ol500692j
_journal_volume                  16
_journal_year                    2014
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C20 H24 O2'
_chemical_formula_sum            'C20 H24 O2'
_chemical_formula_weight         296.39
_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                   10.1035(4)
_cell_length_b                   10.4542(5)
_cell_length_c                   15.8794(7)
_cell_measurement_reflns_used    9873
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      69.14
_cell_measurement_theta_min      2.78
_cell_volume                     1677.25(13)
_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      100(2)
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.988
_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           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0448
_diffrn_reflns_av_sigmaI/netI    0.0385
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            14690
_diffrn_reflns_theta_full        69.27
_diffrn_reflns_theta_max         69.27
_diffrn_reflns_theta_min         5.06
_exptl_absorpt_coefficient_mu    0.578
_exptl_absorpt_correction_T_max  0.8458
_exptl_absorpt_correction_T_min  0.5691
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.174
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             640
_exptl_crystal_size_max          1.10
_exptl_crystal_size_mid          0.45
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.233
_refine_diff_density_min         -0.299
_refine_diff_density_rms         0.073
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.0(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.154
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     202
_refine_ls_number_reflns         3038
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.154
_refine_ls_R_factor_all          0.0428
_refine_ls_R_factor_gt           0.0428
_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^)+(0.0760P)^2^+0.2440P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1179
_refine_ls_wR_factor_ref         0.1179
_reflns_number_gt                3031
_reflns_number_total             3038
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol500692j_si_003.cif
_cod_data_source_block           cu_khj0_0m
_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/rss-feeds/ACS/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 

 Adding full bibliography for
 ./tmp-cod-update-bibliographies-8800/cifs/1514223.cif.
;
_cod_database_code               1514223