Investigation on Lewis Acid Mediated Diels-Alder Reactions of 2-Phosphono-2-alkenoates. Application to Total Synthesis of (\±)-α-Alasken-8-one via Reductive Alkylation of Resulting Adduct
Chuan-Cheng Liao; Jia-Liang Zhu; Journal of Organic Chemistry 74 (2009) 7873–7884; doi:10.1021/jo9017292

data_4024929
_publ_section_title
;
Investigation on Lewis Acid Mediated Diels-Alder Reactions of
2-Phosphono-2-alkenoates. Application to Total Synthesis of
(\+-)-\a-Alasken-8-one via Reductive Alkylation of Resulting Adduct
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_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              7873
_journal_page_last               7884
_journal_paper_doi               10.1021/jo9017292
_journal_volume                  74
_journal_year                    2009
_chemical_formula_sum            'C21 H30 N2 O4 S'
_chemical_formula_weight         406.53
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                97.156(9)
_cell_angle_beta                 93.314(9)
_cell_angle_gamma                113.986(6)
_cell_formula_units_Z            2
_cell_length_a                   8.259(2)
_cell_length_b                   9.835(3)
_cell_length_c                   15.008(6)
_cell_measurement_reflns_used    1621
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      0.00
_cell_measurement_theta_min      0.00
_cell_volume                     1097.2(6)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0282
_diffrn_reflns_av_sigmaI/netI    0.0530
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            6856
_diffrn_reflns_theta_full        25.09
_diffrn_reflns_theta_max         25.09
_diffrn_reflns_theta_min         2.30
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.175
_exptl_absorpt_correction_T_max  0.9810
_exptl_absorpt_correction_T_min  0.9175
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.231
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             436
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.29
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.403
_refine_diff_density_min         -0.274
_refine_diff_density_rms         0.061
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.004
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     262
_refine_ls_number_reflns         3830
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.004
_refine_ls_R_factor_all          0.1140
_refine_ls_R_factor_gt           0.0785
_refine_ls_shift/su_max          0.020
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0284P)^2^+3.2227P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1868
_refine_ls_wR_factor_ref         0.1980
_reflns_number_gt                2536
_reflns_number_total             3830
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo9017292_si_002_3.cif
_cod_data_source_block           16
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
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_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4024929