Lewis Base Switched [3+3] and [4+2] Annulation Reaction of δ-Acetoxy Allenoates with Cyclic N-Sulfonyl Imines: Divergent Synthesis of Functionalized α-Pyridyl Acetates and Teraryl Scaffolds.
Arupula, Sanjeeva K.; Qureshi, Asif Ali; Swamy, K. C. Kumara; The Journal of organic chemistry  (2020) –; doi:10.1021/acs.joc.9b03281

data_4037993
_publ_section_title
;
 Lewis Base Switched [3+3] and [4+2] Annulation Reaction of \d-Acetoxy
 Allenoates with Cyclic N-Sulfonyl Imines: Divergent Synthesis of
 Functionalized \a-Pyridyl Acetates and Teraryl Scaffolds.
;
_journal_name_full               'The Journal of organic chemistry'
_journal_paper_doi               10.1021/acs.joc.9b03281
_journal_year                    2020
_chemical_formula_sum            'C22 H19 N O5'
_chemical_formula_weight         377.38
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_cell_setting           monoclinic
_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                 90.805(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.2221(4)
_cell_length_b                   10.3384(4)
_cell_length_c                   16.5378(6)
_cell_measurement_reflns_used    7165
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      26.0520
_cell_measurement_theta_min      2.1710
_cell_volume                     1918.50(12)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type
'XtaLAB Synergy, Single source at offset/far, HyPix3000'
_diffrn_measurement_method       '\w 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  0.0369
_diffrn_reflns_av_sigmaI/netI    0.0344
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            15807
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.18
_exptl_absorpt_coefficient_mu    0.093
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.307
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Neddles
_exptl_crystal_F_000             792
_exptl_crystal_size_max          0.02
_exptl_crystal_size_mid          0.01
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.182
_refine_diff_density_min         -0.200
_refine_diff_density_rms         0.036
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.118
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     256
_refine_ls_number_reflns         3376
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.118
_refine_ls_R_factor_all          0.0807
_refine_ls_R_factor_gt           0.0498
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0763P)^2^+0.0159P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1356
_refine_ls_wR_factor_ref         0.1532
_reflns_number_gt                2161
_reflns_number_total             3376
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo9b03281_si_002.cif
_cod_data_source_block           Compound5bd
_cod_database_code               4037993