Evolution of a Synthetic Strategy: Total Synthesis of (\±)-Welwitindolinone A Isonitrile
Sarah E. Reisman; Joseph M. Ready; Matthew M. Weiss; Atsushi Hasuoka; Makoto Hirata; Kazuhiko Tamaki; Timo V. Ovaska; Catherine J. Smith; John L. Wood; Journal of the American Chemical Society 130 (2008) 2087–2100; doi:10.1021/ja076663z

data_4107406
_publ_section_title
;
 Evolution of a Synthetic Strategy: Total Synthesis of
 (\+-)-Welwitindolinone A Isonitrile
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              2087
_journal_page_last               2100
_journal_paper_doi               10.1021/ja076663z
_journal_volume                  130
_journal_year                    2008
_chemical_formula_sum            'C20 H22 Cl N O2'
_chemical_formula_weight         343.84
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 100.01(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   19.495(4)
_cell_length_b                   6.6031(13)
_cell_length_c                   13.671(3)
_cell_measurement_temperature    173(2)
_cell_volume                     1733.0(6)
_computing_cell_refinement       Denzo
_computing_data_collection       'Nonius Collect'
_computing_data_reduction        Denzo
_computing_molecular_graphics    XP
_computing_publication_material  XCIF
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.947
_diffrn_measured_fraction_theta_max 0.947
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       '\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  0.0772
_diffrn_reflns_av_sigmaI/netI    0.1274
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            5651
_diffrn_reflns_theta_full        26.99
_diffrn_reflns_theta_max         26.99
_diffrn_reflns_theta_min         3.03
_exptl_absorpt_coefficient_mu    0.232
_exptl_absorpt_correction_T_max  0.9817
_exptl_absorpt_correction_T_min  0.9660
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            plate
_exptl_crystal_density_diffrn    1.318
_exptl_crystal_description       colorless
_exptl_crystal_F_000             728
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.311
_refine_diff_density_min         -0.284
_refine_diff_density_rms         0.066
_refine_ls_extinction_coef       0.015(4)
_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   1.103
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     222
_refine_ls_number_reflns         3581
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.103
_refine_ls_R_factor_all          0.1590
_refine_ls_R_factor_gt           0.0773
_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^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1809
_refine_ls_wR_factor_ref         0.2199
_reflns_number_gt                1897
_reflns_number_total             3581
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja076663z-file003.cif
_cod_data_source_block           sr06
_cod_original_cell_volume        1733.1(6)
_cod_database_code               4107406