Total Syntheses of Chelidonine and Norchelidonine via an Enamide-Benzyne-[2 + 2] Cycloaddition Cascade.
Ma, Zhi-Xiong; Feltenberger, John B.; Hsung, Richard P.; Organic letters 14 (2012) 2742–2745; doi:10.1021/ol300967a

data_1507720
_publ_section_title
;
 Total Syntheses of Chelidonine and Norchelidonine via an
 Enamide-Benzyne-[2 + 2] Cycloaddition Cascade.
;
_journal_issue                   11
_journal_name_full               'Organic letters'
_journal_page_first              2742
_journal_page_last               2745
_journal_paper_doi               10.1021/ol300967a
_journal_volume                  14
_journal_year                    2012
_chemical_formula_moiety         'C19 H17 N O5'
_chemical_formula_sum            'C19 H17 N O5'
_chemical_formula_weight         339.34
_chemical_name_common            12089a
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                82.166(1)
_cell_angle_beta                 78.000(1)
_cell_angle_gamma                82.390(1)
_cell_formula_units_Z            2
_cell_length_a                   7.3309(7)
_cell_length_b                   9.4470(9)
_cell_length_c                   11.4605(11)
_cell_measurement_reflns_used    2987
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.43
_cell_measurement_theta_min      2.69
_cell_volume                     764.66(13)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0244
_diffrn_reflns_av_sigmaI/netI    0.0277
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            8848
_diffrn_reflns_theta_full        27.45
_diffrn_reflns_theta_max         27.45
_diffrn_reflns_theta_min         1.83
_exptl_absorpt_coefficient_mu    0.108
_exptl_absorpt_correction_T_max  0.9957
_exptl_absorpt_correction_T_min  0.9633
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008/1)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.474
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             356
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.261
_refine_diff_density_min         -0.259
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     230
_refine_ls_number_reflns         3460
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.0548
_refine_ls_R_factor_gt           0.0418
_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^)+(0.0545P)^2^+0.1793P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1033
_refine_ls_wR_factor_ref         0.1121
_reflns_number_gt                2718
_reflns_number_total             3460
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol300967a_si_004.cif
_cod_data_source_block           12089a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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      P-1
_cod_database_code               1507720