Highly stereoselective [4 + 3] cycloadditions of nitrogen-stabilized oxyallyl cations with pyrroles: an approach to parvineostemonine.
Antoline, Jennifer E.; Hsung, Richard P.; Huang, Jian; Song, Zhenlei; Li, Gang; Organic letters 9 (2007) 1275–1278; doi:10.1021/ol070103n

data_1505331
_publ_section_title
;
 Highly stereoselective [4 + 3] cycloadditions of nitrogen-stabilized
 oxyallyl cations with pyrroles: an approach to parvineostemonine.
;
_journal_issue                   7
_journal_name_full               'Organic letters'
_journal_page_first              1275
_journal_page_last               1278
_journal_paper_doi               10.1021/ol070103n
_journal_volume                  9
_journal_year                    2007
_chemical_absolute_configuration rm
_chemical_formula_moiety         'C25 H26 N2 O3'
_chemical_formula_sum            'C25 H26 N2 O3'
_chemical_formula_weight         402.48
_chemical_name_common            06266a
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_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                 111.723(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            6
_cell_length_a                   21.557(3)
_cell_length_b                   6.5449(8)
_cell_length_c                   24.219(3)
_cell_measurement_reflns_used    2581
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      23.17
_cell_measurement_theta_min      2.52
_cell_volume                     3174.4(7)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'SIR-2002, '
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0495
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_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            17358
_diffrn_reflns_theta_full        25.04
_diffrn_reflns_theta_max         25.04
_diffrn_reflns_theta_min         1.59
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.9958
_exptl_absorpt_correction_T_min  0.9596
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2003)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.263
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Needle
_exptl_crystal_F_000             1284
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.547
_refine_diff_density_min         -0.278
_refine_diff_density_rms         0.047
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.6(16)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     814
_refine_ls_number_reflns         6086
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0865
_refine_ls_R_factor_gt           0.0482
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0751P)^2^+0.8176P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1156
_refine_ls_wR_factor_ref         0.1386
_reflns_number_gt                4348
_reflns_number_total             6086
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol070103nsi20070114_040224.cif
_cod_data_source_block           06266a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Multi-scan'
changed to 'multi-scan' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        3174.3(6)
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               1505331