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_4024927
_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
;
_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            'C19 H28 N2 O5 P S'
_chemical_formula_weight         427.46
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 115.689(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   22.9730(19)
_cell_length_b                   9.0132(7)
_cell_length_c                   23.6517(18)
_cell_measurement_reflns_used    3252
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      25.73
_cell_measurement_theta_min      2.46
_cell_volume                     4413.3(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 0.990
_diffrn_measured_fraction_theta_max 0.990
_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  0.0287
_diffrn_reflns_av_sigmaI/netI    0.0367
_diffrn_reflns_limit_h_max       27
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            11251
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         1.91
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.250
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.287
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             1816
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.436
_refine_diff_density_min         -0.320
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.011
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     253
_refine_ls_number_reflns         4062
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.011
_refine_ls_R_factor_all          0.0856
_refine_ls_R_factor_gt           0.0544
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0881P)^2^+7.6604P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1494
_refine_ls_wR_factor_ref         0.1779
_reflns_number_gt                2772
_reflns_number_total             4062
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo9017292_si_002_1.cif
_cod_data_source_block           5
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 
;
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               4024927