A versatile cascade of intramolecular Vilsmeier-Haack and azomethine ylide 1,3-dipolar cycloaddition toward tricyclic cores of alkaloids.
Lévesque, François; Bélanger, Guillaume; Organic letters 10 (2008) 4939–4942; doi:10.1021/ol802010n

data_1504930
_publ_section_title
;
 A versatile cascade of intramolecular Vilsmeier-Haack and azomethine
 ylide 1,3-dipolar cycloaddition toward tricyclic cores of alkaloids.
;
_journal_issue                   21
_journal_name_full               'Organic letters'
_journal_page_first              4939
_journal_page_last               4942
_journal_paper_doi               10.1021/ol802010n
_journal_volume                  10
_journal_year                    2008
_chemical_absolute_configuration unk
_chemical_formula_sum            'C16 H23 N O5'
_chemical_formula_weight         309.35
_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_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.3
_audit_creation_date             2008-02-05T12:46:51-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.221(5)
_cell_length_b                   10.099(3)
_cell_length_c                   20.920(13)
_cell_measurement_reflns_used    20
_cell_measurement_temperature    198(2)
_cell_measurement_theta_max      12.5
_cell_measurement_theta_min      10
_cell_volume                     1525.6(15)
_computing_cell_refinement       Difrac
_computing_data_collection       Difrac
_computing_data_reduction        NRCVAX
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      198(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  CAD4
_diffrn_measurement_method       Omega/2theta
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0
_diffrn_reflns_av_unetI/netI     0.0874
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            1659
_diffrn_reflns_theta_full        25.5
_diffrn_reflns_theta_max         25.57
_diffrn_reflns_theta_min         1.95
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 100
_diffrn_standards_number         1
_exptl_absorpt_coefficient_mu    0.1
_exptl_absorpt_correction_T_max  0.9803
_exptl_absorpt_correction_T_min  0.9518
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   Empirical
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.347
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Needle
_exptl_crystal_F_000             664
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.215
_refine_diff_density_min         -0.207
_refine_diff_density_rms         0.054
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   1(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.958
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     201
_refine_ls_number_reflns         1659
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.958
_refine_ls_R_factor_all          0.1234
_refine_ls_R_factor_gt           0.0514
_refine_ls_shift/su_max          0
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0413P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0841
_refine_ls_wR_factor_ref         0.0992
_reflns_number_gt                976
_reflns_number_total             1659
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol802010n_si_002.cif
_cod_data_source_block           fl892
_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.

'_exptl_absorpt_correction_type' value 'Psi-Scan'
changed to 'psi-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        1525.6(14)
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               1504930