A new modular indole synthesis. Construction of the highly strained CDEF parent tetracycle of nodulisporic acids A and B.
Smith, 3rd, Amos B; Kürti, Laszló; Davulcu, Akin H.; Organic letters 8 (2006) 2167–2170; doi:10.1021/ol0606536

data_1505984
_publ_section_title
;
 A new modular indole synthesis. Construction of the highly strained CDEF
 parent tetracycle of nodulisporic acids A and B.
;
_journal_issue                   10
_journal_name_full               'Organic letters'
_journal_page_first              2167
_journal_page_last               2170
_journal_paper_doi               10.1021/ol0606536
_journal_volume                  8
_journal_year                    2006
_chemical_formula_sum            'C27 H29 N O'
_chemical_formula_weight         383.51
_space_group_IT_number           5
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      5
_symmetry_space_group_name_Hall  'C 2y'
_symmetry_space_group_name_H-M   'C 1 2 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 101.249(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.451(3)
_cell_length_b                   8.1850(10)
_cell_length_c                   13.7757(17)
_cell_measurement_temperature    143(1)
_cell_volume                     2040.5(5)
_computing_data_collection       'CrystalClear (Rigaku, 1999)'
_computing_data_reduction        'CrystalClear (Rigaku, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Altomare, 1999)'
_diffrn_ambient_temperature      143(1)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device       'CCD Area Detector'
_diffrn_measurement_device_type  'Rigaku Mercury'
_diffrn_measurement_method       'phi and omega rotations'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0420
_diffrn_reflns_av_sigmaI/netI    0.0569
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            5590
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         2.73
_exptl_absorpt_coefficient_mu    0.075
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.8486
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_density_diffrn    1.248
_exptl_crystal_F_000             824
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.113
_refine_diff_density_min         -0.153
_refine_diff_density_rms         0.030
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.8(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.993
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     265
_refine_ls_number_reflns         3028
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.993
_refine_ls_R_factor_all          0.0346
_refine_ls_R_factor_gt           0.0313
_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^)+(0.0402P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0708
_refine_ls_wR_factor_ref         0.0724
_reflns_number_gt                2709
_reflns_number_total             3028
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol0606536si20060316_102242.cif
_cod_data_source_block           shelxl
_cod_original_cell_volume        2040.4(4)
_cod_original_sg_symbol_H-M      'C 2      '
_cod_database_code               1505984