A unified approach to ent-atisane diterpenes and related alkaloids: synthesis of (-)-methyl atisenoate, (-)-isoatisine, and the hetidine skeleton.
Cherney, Emily C.; Lopchuk, Justin M.; Green, Jason C.; Baran, Phil S.; Journal of the American Chemical Society 136 (2014) 12592–12595; doi:10.1021/ja507321j

data_4122504
_publ_section_title
;
 A unified approach to ent-atisane diterpenes and related alkaloids:
 synthesis of (-)-methyl atisenoate, (-)-isoatisine, and the hetidine
 skeleton.
;
_journal_issue                   36
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              12592
_journal_page_last               12595
_journal_paper_doi               10.1021/ja507321j
_journal_volume                  136
_journal_year                    2014
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C21 H30 O3'
_chemical_formula_sum            'C21 H30 O3'
_chemical_formula_weight         330.45
_chemical_name_systematic        ECC-9-020-1
_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   dimap
_audit_creation_date             2013-11-04
_audit_creation_method
;
Olex2 1.2-beta
(compiled 2013.09.17 svn.r2790 for OlexSys, GUI svn.r4601)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.3107(3)
_cell_length_b                   9.0733(3)
_cell_length_c                   26.4224(10)
_cell_measurement_reflns_used    8115
_cell_measurement_temperature    100
_cell_measurement_theta_max      68.255
_cell_measurement_theta_min      3.345
_cell_volume                     1752.66(11)
_computing_cell_refinement       'Bruker Saint'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker Saint'
_computing_molecular_graphics
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_publication_material
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_structure_refinement
;
SHELXL, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_computing_structure_solution
;
SHELX, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_diffrn_ambient_temperature      100.0
_diffrn_detector                 'Bruker APEX CCD'
_diffrn_detector_area_resol_mean 8.0
_diffrn_detector_type            'CCD Area Detector'
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device       'Kappa Four-Circle Diffractometer'
_diffrn_measurement_device_type  'Bruker X8 APEX'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_monochromator  'Double Bounce Multilayer Mirrors'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_radiation_xray_symbol    K-L~3~
_diffrn_reflns_av_R_equivalents  0.0226
_diffrn_reflns_av_unetI/netI     0.0215
_diffrn_reflns_Laue_measured_fraction_full 0.991
_diffrn_reflns_Laue_measured_fraction_max 0.990
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            11352
_diffrn_reflns_point_group_measured_fraction_full 0.985
_diffrn_reflns_point_group_measured_fraction_max 0.984
_diffrn_reflns_theta_full        68.000
_diffrn_reflns_theta_max         68.250
_diffrn_reflns_theta_min         3.345
_diffrn_source                   'Micro Focus Rotating Anode'
_diffrn_source_type              'Bruker FR-591'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.643
_exptl_absorpt_correction_T_max  0.7531
_exptl_absorpt_correction_T_min  0.6619
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2012/1 (Bruker,2012) was used for absorption correction.
wR2(int) was 0.1239 before and 0.0376 after correction.
The Ratio of minimum to maximum transmission is 0.8789.
The \l/2 correction factor is 0.0015.
;
_exptl_crystal_colour            Colorless
_exptl_crystal_colour_primary    Colorless
_exptl_crystal_density_diffrn    1.252
_exptl_crystal_density_method    'Not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.184
_refine_diff_density_min         -0.135
_refine_diff_density_rms         0.030
_refine_ls_abs_structure_details
;
 Flack x determined using 1279 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons and Flack (2004), Acta Cryst. A60, s61).
;
_refine_ls_abs_structure_Flack   0.00(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     220
_refine_ls_number_reflns         3152
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0270
_refine_ls_R_factor_gt           0.0263
_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^)+(0.0340P)^2^+0.4395P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0679
_refine_ls_wR_factor_ref         0.0687
_reflns_Friedel_coverage         0.701
_reflns_Friedel_fraction_full    0.977
_reflns_Friedel_fraction_max     0.976
_reflns_number_gt                3093
_reflns_number_total             3152
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja507321j_si_003.cif
_cod_data_source_block           Baran336
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_absolute_configuration' value 'AD' changed to 'ad'
according to
/home/saulius/struct/COD-crude-data--automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from
2011-04-26.

'_diffrn_radiation_probe' value 'X-ray' changed to
'x-ray' according to
/home/saulius/struct/COD-crude-data--automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 

 Adding full bibliography for 4122504--4122507.cif.
;
_cod_database_code               4122504
_shelxl_version_number           2013-3
_shelx_estimated_absorpt_t_max   0.975
_shelx_estimated_absorpt_t_min   0.893
_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:
 C6(H6), C12(H12), C14(H14)
2.b Secondary CH2 refined with riding coordinates:
 C2(H2A,H2B), C4(H4A,H4B), C5(H5A,H5B), C8(H8A,H8B), C9(H9A,H9B), C10(H10A,
 H10B), C13(H13A,H13B), C16(H16A,H16B)
2.c X=CH2 refined with riding coordinates:
 C21(H21A,H21B)
2.d Idealised Me refined as rotating group:
 C18(H18A,H18B,H18C), C19(H19A,H19B,H19C), C20(H20A,H20B,H20C)
;
_shelx_res_checksum              70646
_shelx_hkl_checksum              5765