Tandem semipinacol-type 1,2-carbon migration/aldol reaction toward the construction of [5-6-7] all-carbon tricyclic core of Calyciphylline A-type alkaloids.
Yang, Ming; Wang, Lin; He, Zheng-He; Wang, Shao-Hua; Zhang, Shu-Yu; Tu, Yong-Qiang; Zhang, Fu-Min; Organic letters 14 (2012) 5114–5117; doi:10.1021/ol302386g

data_1508684
_publ_section_title
;
 Tandem semipinacol-type 1,2-carbon migration/aldol reaction toward the
 construction of [5-6-7] all-carbon tricyclic core of Calyciphylline
 A-type alkaloids.
;
_journal_issue                   19
_journal_name_full               'Organic letters'
_journal_page_first              5114
_journal_page_last               5117
_journal_paper_doi               10.1021/ol302386g
_journal_volume                  14
_journal_year                    2012
_chemical_formula_sum            'C15 H22 O2'
_chemical_formula_weight         234.33
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                97.430(7)
_cell_angle_beta                 103.628(7)
_cell_angle_gamma                96.743(7)
_cell_formula_units_Z            4
_cell_length_a                   8.404(6)
_cell_length_b                   12.590(9)
_cell_length_c                   12.974(10)
_cell_measurement_reflns_used    2325
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      23.53
_cell_measurement_theta_min      2.51
_cell_volume                     1307.2(17)
_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 0.981
_diffrn_measured_fraction_theta_max 0.981
_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  0.0470
_diffrn_reflns_av_sigmaI/netI    0.0730
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            9203
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.13
_exptl_absorpt_coefficient_mu    0.077
_exptl_absorpt_correction_T_max  0.9840
_exptl_absorpt_correction_T_min  0.9810
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.191
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             512
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.21
_refine_diff_density_max         0.196
_refine_diff_density_min         -0.173
_refine_diff_density_rms         0.038
_refine_ls_extinction_coef       0.025(3)
_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   1.023
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     324
_refine_ls_number_reflns         4785
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.022
_refine_ls_R_factor_all          0.0824
_refine_ls_R_factor_gt           0.0521
_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^)+(0.0611P)^2^+0.0995P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1281
_refine_ls_wR_factor_ref         0.1470
_reflns_number_gt                3152
_reflns_number_total             4785
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol302386g_si_003.cif
_cod_data_source_block           p-1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               1508684