Tandem Decarboxylative Cyclization/Alkenylation Strategy for Total Syntheses of (+)-Longirabdiol, (-)-Longirabdolactone, and (-)-Effusin.
Zhang, Jianpeng; Li, Zijian; Zhuo, Junming; Cui, Yue; Han, Ting; Li, Chao; Journal of the American Chemical Society 141 (2019) 8372–8380; doi:10.1021/jacs.9b03978

data_4127342
_publ_section_title
;
 Tandem Decarboxylative Cyclization/Alkenylation Strategy for Total
 Syntheses of (+)-Longirabdiol, (-)-Longirabdolactone, and (-)-Effusin.
;
_journal_issue                   20
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              8372
_journal_page_last               8380
_journal_paper_doi               10.1021/jacs.9b03978
_journal_volume                  141
_journal_year                    2019
_chemical_formula_sum            'C10 H14 O4'
_chemical_formula_weight         198.21
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 108.914(4)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   21.1666(10)
_cell_length_b                   7.7501(3)
_cell_length_c                   12.9540(5)
_cell_measurement_reflns_used    10352
_cell_measurement_temperature    180.00(10)
_cell_measurement_theta_max      30.1810
_cell_measurement_theta_min      4.3490
_cell_volume                     2010.28(15)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      180.00(10)
_diffrn_detector                 'CCD plate'
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'XtaLAB AFC12 (RINC): Kappa single'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0227
_diffrn_reflns_av_unetI/netI     0.0136
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            16812
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.370
_diffrn_reflns_theta_min         3.963
_diffrn_source                   'fine-focus sealed X-ray tube'
_diffrn_source_type              'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.101
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.65919
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.39.28b (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.310
_exptl_crystal_description       block
_exptl_crystal_F_000             848
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.264
_refine_diff_density_min         -0.191
_refine_diff_density_rms         0.040
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     129
_refine_ls_number_reflns         2051
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0354
_refine_ls_R_factor_gt           0.0337
_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^)+(0.0557P)^2^+0.9797P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0941
_refine_ls_wR_factor_ref         0.0958
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1913
_reflns_number_total             2051
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja9b03978_si_003.cif
_cod_data_source_block           3
_cod_database_code               4127342
_shelx_shelxl_version_number     2014/7
_cell_oxdiff_measurement_reflns_used 10351
_shelx_res_checksum              20716
_shelx_hkl_checksum              33951