Total synthesis of (–)-aritasone via the ultra-high pressure hetero-Diels-Alder dimerisation of (–)-pinocarvone
Uroos, Maliha; Pitt, Phillip; Harwood, Laurence Marius; Lewis, William; Blake, Alexander J.; Hayes, Christopher J. J; Org. Biomol. Chem.  (2017) –; doi:10.1039/C7OB02204B

data_7155891
_publ_section_title
;
 Total synthesis of (--)-aritasone via the ultra-high pressure
 hetero-Diels-Alder dimerisation of (--)-pinocarvone
;
_journal_name_full               'Org. Biomol. Chem.'
_journal_paper_doi               10.1039/C7OB02204B
_journal_year                    2017
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C20 H28 O2'
_chemical_formula_sum            'C20 H28 O2'
_chemical_formula_weight         300.42
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2017-08-29
_audit_creation_method
;
Olex2 1.2
(compiled 2017.08.10 svn.r3458 for OlexSys, GUI svn.r5381)
;
_audit_update_record
;
2017-08-29 deposited with the CCDC.
2017-09-21 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.6086(3)
_cell_length_b                   9.9529(5)
_cell_length_c                   25.6799(13)
_cell_measurement_reflns_used    23682
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      2.9
_cell_volume                     1689.09(14)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT, SADABS and XPREP'
_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    'ShelXS-1997 (Sheldrick, 2008)'
_diffrn_ambient_environment      'N2 gas'
_diffrn_ambient_temperature      120(2)
_diffrn_crystal_treatment        'flash frozen in gaseous N2'
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\w scans'
_diffrn_measurement_specimen_support 'MiTeGen micromount'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0370
_diffrn_reflns_av_unetI/netI     0.0466
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.986
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            11395
_diffrn_reflns_point_group_measured_fraction_full 0.985
_diffrn_reflns_point_group_measured_fraction_max 0.960
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.688
_diffrn_reflns_theta_min         3.139
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.794
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS 2007/4; Sheldrick, 1996)'
_exptl_crystal_colour            'clear colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.181
_exptl_crystal_density_meas      x
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.226
_refine_diff_density_min         -0.209
_refine_diff_density_rms         0.047
_refine_ls_abs_structure_details
;
 Flack x determined using 1192 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   1.8(7)
_refine_ls_extinction_coef       0.0031(9)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2017/1 (Sheldrick 2017)'
_refine_ls_goodness_of_fit_ref   1.063
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     204
_refine_ls_number_reflns         3795
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.063
_refine_ls_R_factor_all          0.0607
_refine_ls_R_factor_gt           0.0502
_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^)+1.0793P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0924
_refine_ls_wR_factor_ref         0.0988
_reflns_Friedel_coverage         0.681
_reflns_Friedel_fraction_full    0.969
_reflns_Friedel_fraction_max     0.925
_reflns_number_gt                3374
_reflns_number_total             3795
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7ob02204b2.cif
_cod_data_source_block           spocpr
_cod_database_code               7155891
_nottingham_internal_coll_name   SPOCPR
_nottingham_internal_coll_number 8600
_nottingham_internal_coll_client MU/CJH
_nottingham_internal_coll_frame_width 0.3
_nottingham_internal_coll_user   pczajb
_nottingham_internal_coll_location NOTTS
_nottingham_internal_coll_instrument 'SMART APEX'
_nottingham_internal_process_user pczajb
_nottingham_internal_validation_date 29/8/2017
_nottingham_internal_validation_user pczwl
_shelx_shelxl_version_number     2017/1
_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
2.a Ternary CH refined with riding coordinates:
 C3(H3), C4(H4), C11(H11), C12(H12)
2.b Secondary CH2 refined with riding coordinates:
 C2(H2A,H2B), C5(H5A,H5B), C7(H7A,H7B), C8(H8A,H8B), C10(H10A,H10B), C13(H13A,
 H13B)
2.c Idealised Me refined as rotating group:
 C16(H16A,H16B,H16C), C17(H17A,H17B,H17C), C19(H19A,H19B,H19C), C20(H20A,H20B,
 H20C)
;
_shelx_res_checksum              9255
_olex2_date_sample_data_collection 2009-05-26
_olex2_date_sample_submission    2009-04-25
_olex2_exptl_crystal_mounting_method 'in fomblin film on a micromount'
_olex2_submission_special_instructions 'No special instructions were received'