Studies on the synthesis of gymnodimine. construction of the spiroimine portion via Diels-Alder cycloaddition.
White, James D.; Wang, Guoqiang; Quaranta, Laura; Organic letters 5 (2003) 4983–4986; doi:10.1021/ol035939e

data_1507415
_publ_section_title
;
 Studies on the synthesis of gymnodimine. construction of the spiroimine
 portion via Diels-Alder cycloaddition.
;
_journal_issue                   26
_journal_name_full               'Organic letters'
_journal_page_first              4983
_journal_page_last               4986
_journal_paper_doi               10.1021/ol035939e
_journal_volume                  5
_journal_year                    2003
_chemical_formula_sum            'C15 H20 O5'
_chemical_formula_weight         280.31
_chemical_name_systematic        ?
_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                   9.3780(11)
_cell_length_b                   10.9680(12)
_cell_length_c                   13.9660(10)
_cell_measurement_reflns_used    63
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      22.37
_cell_measurement_theta_min      7.5
_cell_volume                     1436.5(3)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'Siemens XSCANS'
_computing_molecular_graphics    'ORTEP III for Windows'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    SHELXS-97
_diffrn_ambient_temperature      290(2)
_diffrn_measured_fraction_theta_full 0.923
_diffrn_measured_fraction_theta_max 0.923
_diffrn_measurement_device       'Siemens P4'
_diffrn_measurement_method       '\w/2\q scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0209
_diffrn_reflns_av_sigmaI/netI    0.0322
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            2560
_diffrn_reflns_theta_full        67.51
_diffrn_reflns_theta_max         67.51
_diffrn_reflns_theta_min         5.13
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.802
_exptl_absorpt_correction_T_max  0.8411
_exptl_absorpt_correction_T_min  0.5005
_exptl_absorpt_correction_type   Semi-empirical
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.296
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             600
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.139
_refine_diff_density_min         -0.111
_refine_diff_density_rms         0.029
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.2(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.055
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     185
_refine_ls_number_reflns         2203
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.055
_refine_ls_R_factor_all          0.0370
_refine_ls_R_factor_gt           0.0340
_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^)+(0.0472P)^2^+0.1784P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0910
_refine_ls_wR_factor_ref         0.0933
_reflns_number_gt                2034
_reflns_number_total             2203
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol035939esi20031003_061514.cif
_cod_data_source_block           gw112302
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1507415