"One-pot" access to dihydrofurans via tandem oxidative difunctionalization and ring contraction of aminopyrans.
Mandha, Santhosh Reddy; Alla, Manjula; Nanubolu, Jagadeesh Babu; Organic & biomolecular chemistry 12 (2014) 4412–4420; doi:10.1039/c4ob00324a

data_7153888
_publ_section_title
;
 &quot;One-pot&quot; access to dihydrofurans via tandem oxidative
 difunctionalization and ring contraction of aminopyrans.
;
_journal_issue                   25
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              4412
_journal_page_last               4420
_journal_paper_doi               10.1039/c4ob00324a
_journal_volume                  12
_journal_year                    2014
_chemical_formula_moiety         'C22 H20 N2 O3'
_chemical_formula_sum            'C22 H20 N2 O3'
_chemical_formula_weight         360.40
_chemical_name_systematic
;
Dimethyl 3-phenylnaphtho[1,2-b]furan-2,2(3H)-bis(carbimidate)
;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   15.9828(14)
_cell_length_b                   6.8208(6)
_cell_length_c                   34.232(3)
_cell_measurement_reflns_used    6764
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      26.73
_cell_measurement_theta_min      2.55
_cell_volume                     3731.8(6)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  '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  0.0386
_diffrn_reflns_av_sigmaI/netI    0.0203
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       40
_diffrn_reflns_limit_l_min       -40
_diffrn_reflns_number            32809
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.74
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.9880
_exptl_absorpt_correction_T_min  0.9639
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   ' Bruker AXS SADABS program'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.283
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1520
_exptl_crystal_size_max          0.43
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.221
_refine_diff_density_min         -0.143
_refine_diff_density_rms         0.031
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.049
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     254
_refine_ls_number_reflns         3277
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.049
_refine_ls_R_factor_all          0.0419
_refine_ls_R_factor_gt           0.0383
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0472P)^2^+1.1116P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0986
_refine_ls_wR_factor_ref         0.1018
_reflns_number_gt                2964
_reflns_number_total             3277
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4ob00324a2.cif
_cod_data_source_block           as30
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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        3731.9(6)
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7153888