Protecting-Group-Free Syntheses of <i>ent</i>-Kaurane Diterpenoids: [3+2+1] Cycloaddition/Cycloalkenylation Approach.
Wang, Jin; Hong, Benke; Hu, Dachao; Kadonaga, Yuichiro; Tang, Ruyao; Lei, Xiaoguang; Journal of the American Chemical Society  (2020) –; doi:10.1021/jacs.9b13722

data_4134074
_publ_section_title
;
 Protecting-Group-Free Syntheses of <i>ent</i>-Kaurane Diterpenoids:
 [3+2+1] Cycloaddition/Cycloalkenylation Approach.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.9b13722
_journal_year                    2020
_chemical_formula_sum            'C20 H30 O2'
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_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
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_atom_sites_solution_primary     dual
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_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      179.99(10)
_diffrn_detector                 'CCD plate'
_diffrn_measured_fraction_theta_full 0.999
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_diffrn_radiation_monochromator  graphite
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_diffrn_reflns_av_unetI/netI     0.0396
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_diffrn_source                   'fine-focus sealed X-ray tube'
_diffrn_source_type              'Enhance (Mo) X-ray Source'
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_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.60804
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.39.29a (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
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_refine_ls_extinction_method     none
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_refine_ls_number_reflns         3915
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.0638
_refine_ls_R_factor_gt           0.0520
_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^)+(0.0888P)^2^+0.1600P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1451
_refine_ls_wR_factor_ref         0.1529
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_reflns_number_gt                3138
_reflns_number_total             3915
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja9b13722_si_008.cif
_cod_data_source_block           3
_cod_database_code               4134074
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              21343
_shelx_hkl_checksum              57312