Palladium-Catalyzed One-Pot Highly Regioselective 6- Endo Cyclization and Alkylation of Enynoates: Synthesis of 2-Alkanone Pyrones.
Ahmad, Tanveer; Qiu, Sheng-Qi; Xu, Yun-He; Loh, Teck-Peng; The Journal of organic chemistry 83 (2018) 13414–13426; doi:10.1021/acs.joc.8b02198

data_4035724
_publ_section_title
;
 Palladium-Catalyzed One-Pot Highly Regioselective 6- Endo Cyclization and
 Alkylation of Enynoates: Synthesis of 2-Alkanone Pyrones.
;
_journal_issue                   21
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              13414
_journal_page_last               13426
_journal_paper_doi               10.1021/acs.joc.8b02198
_journal_volume                  83
_journal_year                    2018
_chemical_formula_sum            'C16 H16 O3'
_chemical_formula_weight         256.29
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2013
_cell_angle_alpha                90
_cell_angle_beta                 108.431(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   13.4563(3)
_cell_length_b                   11.6667(2)
_cell_length_c                   9.5707(2)
_cell_measurement_reflns_used    3022
_cell_measurement_temperature    291(2)
_cell_measurement_theta_max      71.1930
_cell_measurement_theta_min      5.1170
_cell_volume                     1425.44(5)
_computing_cell_refinement       'CrysAlisPro (Rigaku OD, 2015)'
_computing_data_collection       'CrysAlisPro (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro (Rigaku OD, 2015)'
_computing_molecular_graphics    'Ortep-3 (L. J. Farrugia, 2001)'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      291(2)
_diffrn_detector_area_resol_mean 5.2169
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.970
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, AtlasS2'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0123
_diffrn_reflns_av_unetI/netI     0.0161
_diffrn_reflns_Laue_measured_fraction_full 0.995
_diffrn_reflns_Laue_measured_fraction_max 0.970
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            5180
_diffrn_reflns_point_group_measured_fraction_full 0.995
_diffrn_reflns_point_group_measured_fraction_max 0.970
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         71.319
_diffrn_reflns_theta_min         3.462
_diffrn_source                   'micro-focus sealed X-ray tube'
_exptl_absorpt_coefficient_mu    0.662
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.64530
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.38.46 (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.194
_exptl_crystal_description       block
_exptl_crystal_F_000             544
_exptl_crystal_size_max          0.250
_exptl_crystal_size_mid          0.220
_exptl_crystal_size_min          0.210
_refine_diff_density_max         0.188
_refine_diff_density_min         -0.151
_refine_diff_density_rms         0.032
_refine_ls_extinction_coef       0.0030(5)
_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   1.068
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     175
_refine_ls_number_reflns         2686
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.068
_refine_ls_R_factor_all          0.0494
_refine_ls_R_factor_gt           0.0424
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0641P)^2^+0.1961P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1194
_refine_ls_wR_factor_ref         0.1257
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2263
_reflns_number_total             2686
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo8b02198_si_002.cif
_cod_data_source_block           shelxl
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4035724
_shelx_estimated_absorpt_t_min   0.852
_shelx_estimated_absorpt_t_max   0.873
_shelxl_version_number           2013-4
_shelx_res_checksum              660
_shelx_hkl_checksum              33037