N-heterocyclic carbene-promoted annulation reaction of allenals with chalcones: synthesis of polysubstituted pyranyl aldehydes.
Ma, Dengke; Qiu, Youai; Dai, Jianxin; Fu, Chunling; Ma, Shengming; Organic letters 16 (2014) 4742–4745; doi:10.1021/ol5021509

data_1517550
_publ_section_title
;
 N-heterocyclic carbene-promoted annulation reaction of allenals with
 chalcones: synthesis of polysubstituted pyranyl aldehydes.
;
_journal_issue                   18
_journal_name_full               'Organic letters'
_journal_page_first              4742
_journal_page_last               4745
_journal_paper_doi               10.1021/ol5021509
_journal_volume                  16
_journal_year                    2014
_chemical_formula_moiety         'C27 H23 N O4'
_chemical_formula_sum            'C27 H23 N O4'
_chemical_formula_weight         425.46
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 99.063(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.6719(3)
_cell_length_b                   19.4897(5)
_cell_length_c                   10.9956(3)
_cell_measurement_reflns_used    5197
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      67.3149
_cell_measurement_theta_min      4.0679
_cell_volume                     2258.45(11)
_computing_cell_refinement       'CrysAlis PRO (Agilent Technologies, 2011)'
_computing_data_collection       'CrysAlis PRO'
_computing_data_reduction        'CrysAlis PRO'
_computing_molecular_graphics    'OLEX2 (Dolomanov et al., 2009)'
_computing_publication_material  OLEX2
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 10.3592
_diffrn_measured_fraction_theta_full 0.985
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'Xcalibur, Atlas, Gemini ultra'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0367
_diffrn_reflns_av_sigmaI/netI    0.0259
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            14856
_diffrn_reflns_theta_full        67.43
_diffrn_reflns_theta_max         67.43
_diffrn_reflns_theta_min         4.20
_exptl_absorpt_coefficient_mu    0.679
_exptl_absorpt_correction_T_max  0.8223
_exptl_absorpt_correction_T_min  0.7825
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlis PRO (Agilent Technologies, 2011) 
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.251
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             896
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.146
_refine_diff_density_min         -0.139
_refine_diff_density_rms         0.030
_refine_ls_extinction_coef       0.0031(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   1.020
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     291
_refine_ls_number_reflns         4007
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0498
_refine_ls_R_factor_gt           0.0391
_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^)+(0.0518P)^2^+0.3652P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0996
_refine_ls_wR_factor_ref         0.1092
_reflns_number_gt                3249
_reflns_number_total             4007
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol5021509_si_003.cif
_cod_data_source_block           140411_mdk_4_073_2
_cod_depositor_comments
'Adding full bibliography for 1517550--1517552.cif.'
_cod_original_cell_volume        2258.44(10)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               1517550