Metal-Free Brønsted Acid-Catalyzed Rearrangement of δ-Hydroxyalkynones to 2,3-Dihydro-4 H-pyran-4-ones: Total Synthesis of Obolactone and a Catechol Pyran Isolated from Plectranthus sylvestris.
Gholap, Sachin P.; Jangid, Dashrath; Fernandes, Rodney A.; The Journal of organic chemistry 84 (2019) 3537–3551; doi:10.1021/acs.joc.8b03141

data_4033935
_publ_section_title
;
 Metal-Free Br\/onsted Acid-Catalyzed Rearrangement of \d-Hydroxyalkynones
 to 2,3-Dihydro-4 H-pyran-4-ones: Total Synthesis of Obolactone and a
 Catechol Pyran Isolated from Plectranthus sylvestris.
;
_journal_issue                   6
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              3537
_journal_page_last               3551
_journal_paper_doi               10.1021/acs.joc.8b03141
_journal_volume                  84
_journal_year                    2019
_chemical_formula_moiety         'C15 H22 O2'
_chemical_formula_sum            'C15 H22 O2'
_chemical_formula_weight         234.32
_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
_atom_sites_solution_primary     dual
_audit_creation_date             2018-10-21
_audit_creation_method
;
Olex2 1.2-ac4
(compiled 2018.05.17 svn.r3504 for Rigaku Oxford Diffraction, GUI svn.r5492)
;
_cell_angle_alpha                90
_cell_angle_beta                 98.052(12)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   21.409(3)
_cell_length_b                   5.8925(6)
_cell_length_c                   10.5126(13)
_cell_measurement_reflns_used    2971
_cell_measurement_temperature    150
_cell_measurement_theta_max      29.5110
_cell_measurement_theta_min      3.8350
_cell_volume                     1313.1(3)
_computing_cell_refinement       'CrysAlisPro 1.171.38.43 (Rigaku OD, 2015)'
_computing_data_collection       'CrysAlisPro 1.171.38.43 (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.38.43 (Rigaku OD, 2015)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      150
_diffrn_detector                 'CCD plate'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_details
;
List of Runs (angles in degrees, time in seconds):

  # Type    Start    End  Width  t~exp~   \w     \q     \k     \f   Frames
--------------------------------------------------------------------------
  1  \w    -59.00  70.00   0.50    8.00    --  -20.00  72.00 -36.00  258
  2  \w   -101.00   5.00   0.50    8.00    --  -20.00 -72.00 108.00  212
  3  \w    -87.00  19.00   0.50    8.00    --  -20.00 -72.00-180.00  212
  4  \w    -59.00  60.50   0.50    8.00    --  -20.00  72.00 108.00  239
  5  \w   -110.00 -77.00   0.50    8.00    --  -20.00   0.00-108.00   66
  6  \w    -69.00 -38.00   0.50    8.00    --  -20.00 -72.00 -36.00   62
  7  \w    -59.00 -17.00   0.50    8.00    --  -20.00  72.00-180.00   84
;
_diffrn_measurement_device       'abstract diffractometer'
_diffrn_measurement_device_type
'dtrek-CrysAlisPro-abstract goniometer imported rigaku-d*trek images'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_type
'CrysAlisPro convention (1999,Acta A55,543-557)'
_diffrn_orient_matrix_UB_11      0.0028509000
_diffrn_orient_matrix_UB_12      0.1197031000
_diffrn_orient_matrix_UB_13      -0.0027301000
_diffrn_orient_matrix_UB_21      -0.0332775000
_diffrn_orient_matrix_UB_22      0.0100626000
_diffrn_orient_matrix_UB_23      -0.0139105000
_diffrn_orient_matrix_UB_31      -0.0020567000
_diffrn_orient_matrix_UB_32      0.0069673000
_diffrn_orient_matrix_UB_33      0.0666684000
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0964
_diffrn_reflns_av_unetI/netI     0.0608
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            12664
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        24.996
_diffrn_reflns_theta_max         24.996
_diffrn_reflns_theta_min         1.921
_diffrn_source                   'fine-focus sealed X-ray tube'
_diffrn_source_type              'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.077
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.58191
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.38.43 (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.185
_exptl_crystal_description       plate
_exptl_crystal_F_000             512
_exptl_crystal_size_max          0.235
_exptl_crystal_size_mid          0.165
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.332
_refine_diff_density_min         -0.295
_refine_diff_density_rms         0.061
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.083
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     158
_refine_ls_number_reflns         2302
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.083
_refine_ls_R_factor_all          0.0976
_refine_ls_R_factor_gt           0.0763
_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^)+(0.1019P)^2^+0.5490P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1872
_refine_ls_wR_factor_ref         0.2067
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1747
_reflns_number_total             2302
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo8b03141_si_007.cif
_cod_data_source_block           raf-spg-965_mo
_cod_database_code               4033935
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_max   0.995
_shelx_estimated_absorpt_t_min   0.982
_reflns_odcompleteness_completeness 94.39
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     31.05
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups, All O(H) groups
2.a Ternary CH refined with riding coordinates:
 C11(H11), C13(H13)
2.b Secondary CH2 refined with riding coordinates:
 C12(H12A,H12B), C14(H14A,H14B), C15(H15A,H15B)
2.c Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C4(H4), C5(H5)
2.d Idealised Me refined as rotating group:
 C8(H8A,H8B,H8C), C9(H9A,H9B,H9C), C10(H10A,H10B,H10C)
2.e Idealised tetrahedral OH refined as rotating group:
 O2(H2A)
;
_shelx_res_checksum              33032
_shelx_hkl_checksum              89147
_olex2_submission_special_instructions 'No special instructions were received'
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
- Detector area scaling
;
_oxdiff_exptl_absorpt_empirical_full_max 3.419
_oxdiff_exptl_absorpt_empirical_full_min 0.537