Stereoselective synthesis of C-fused pyranoindoles, pyranobenzofurans and pyranobenzothiophene scaffolds using oxa-Pictet-Spengler type reaction of vinylogous carbonates.
Gharpure, Santosh J.; Prasath, V.; Organic & biomolecular chemistry 12 (2014) 7397–7409; doi:10.1039/c4ob01387e

data_7154046
_publ_section_title
;
 Stereoselective synthesis of C-fused pyranoindoles, pyranobenzofurans and
 pyranobenzothiophene scaffolds using oxa-Pictet-Spengler type reaction of
 vinylogous carbonates.
;
_journal_issue                   37
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              7397
_journal_page_last               7409
_journal_paper_doi               10.1039/c4ob01387e
_journal_volume                  12
_journal_year                    2014
_chemical_formula_moiety         'C21 H26 O4'
_chemical_formula_sum            'C21 H26 O4'
_chemical_formula_weight         342.42
_chemical_name_systematic
;

 ?

;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 112.109(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.6870(5)
_cell_length_b                   8.3874(3)
_cell_length_c                   17.8893(6)
_cell_measurement_reflns_used    5088
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      28.21
_cell_measurement_theta_min      2.46
_cell_volume                     1902.66(12)
_computing_cell_refinement       APEXII,Bruker,2004
_computing_data_collection       APEXII,Bruker,2004
_computing_data_reduction        SAINT,Bruker,2004
_computing_molecular_graphics    'ORTEP-3 (Farrugia, 1997)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.934
_diffrn_measured_fraction_theta_max 0.890
_diffrn_measurement_device_type  'Bruker APEXII CCD area detector'
_diffrn_measurement_method       'phi and 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  0.0229
_diffrn_reflns_av_sigmaI/netI    0.0270
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            13264
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         28.31
_diffrn_reflns_theta_min         1.61
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  0.9879
_exptl_absorpt_correction_T_min  0.9799
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker,2004)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.195
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Square
_exptl_crystal_F_000             736
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.438
_refine_diff_density_min         -0.337
_refine_diff_density_rms         0.133
_refine_ls_extinction_coef       0.019(2)
_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   1.063
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     228
_refine_ls_number_reflns         4213
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.063
_refine_ls_R_factor_all          0.0895
_refine_ls_R_factor_gt           0.0580
_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^)+(0.0959P)^2^+0.4753P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1486
_refine_ls_wR_factor_ref         0.1798
_reflns_number_gt                2891
_reflns_number_total             4213
_reflns_threshold_expression     >2sigma(I)
_cod_duplicate_entry             7153970
_cod_data_source_file            c4ob01387e2.cif
_cod_data_source_block           new
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/current/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_cell_volume        1902.65(12)
_cod_original_sg_symbol_Hall     '     -P 2yn '
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7154046