A 4 + 3 Cycloaddition Approach to the Synthesis of Spatol. A Formal Total Synthesis of Racemic Spatol
Harmata, Michael; Rashatasakhon, Paitoon; Organic Letters 3 (2001) 2533–; doi:10.1021/ol016200c

data_1507520
_publ_section_title
;
 A 4 + 3 Cycloaddition Approach to the Synthesis of Spatol. A Formal Total
 Synthesis of Racemic Spatol
;
_journal_issue                   16
_journal_name_full               'Organic Letters'
_journal_page_first              2533
_journal_paper_doi               10.1021/ol016200c
_journal_volume                  3
_journal_year                    2001
_chemical_formula_sum            'C13 H12 O3'
_chemical_formula_weight         216.23
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            8
_cell_length_a                   8.1348(4)
_cell_length_b                   12.0317(5)
_cell_length_c                   20.4322(9)
_cell_measurement_reflns_used    5800
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.1
_cell_measurement_theta_min      3.2
_cell_volume                     1999.81(16)
_computing_cell_refinement       'SMART (Bruker, 1998)'
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        'SAINT (Bruker, 1998)'
_computing_molecular_graphics    'ORTEP-III (Burnett & Johnson, 1996)'
_computing_publication_material  'CIFTAB (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker SMART CCD area detector'
_diffrn_measurement_method       'omega 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  0.0274
_diffrn_reflns_av_sigmaI/netI    0.0163
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            11475
_diffrn_reflns_theta_full        27.11
_diffrn_reflns_theta_max         27.11
_diffrn_reflns_theta_min         1.99
_diffrn_standards_decay_%        0.0
_exptl_absorpt_coefficient_mu    0.102
_exptl_absorpt_correction_T_max  1.00
_exptl_absorpt_correction_T_min  0.80
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 Data were corrected for decay and absorption using the program SADABS 
 based on the method of R.H. Blessing (Acta Cryst. A51, 33-38, 1995).
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.436
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             912
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.320
_refine_diff_density_min         -0.185
_refine_diff_density_rms         0.045
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     145
_refine_ls_number_reflns         2213
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0472
_refine_ls_R_factor_gt           0.0398
_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^)+(0.0619P)^2^+0.6060P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1058
_refine_ls_wR_factor_ref         0.1118
_reflns_number_gt                1851
_reflns_number_total             2213
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol016200c_s1.cif
_cod_data_source_block           PR-XI-25-A1
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               1507520