Preparation of pyrrolidine-based PDE4 inhibitors via enantioselective conjugate addition of alpha-substituted malonates to aromatic nitroalkenes.
Nichols, Paul J.; Demattei, John A.; Barnett, Bradley R.; Lefur, Nicole A.; Chuang, Tsung-Hsun; Piscopio, Anthony D.; Koch, Kevin; Organic letters 8 (2006) 1495–1498; doi:10.1021/ol060398p

data_1505934
_publ_section_title
;
 Preparation of pyrrolidine-based PDE4 inhibitors via enantioselective
 conjugate addition of alpha-substituted malonates to aromatic
 nitroalkenes.
;
_journal_issue                   7
_journal_name_full               'Organic letters'
_journal_page_first              1495
_journal_page_last               1498
_journal_paper_doi               10.1021/ol060398p
_journal_volume                  8
_journal_year                    2006
_chemical_formula_sum            'C31 H49 N O5'
_chemical_formula_weight         515.71
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_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   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.3633(3)
_cell_length_b                   12.2983(5)
_cell_length_c                   32.9857(14)
_cell_measurement_reflns_used    5664
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      26.90
_cell_measurement_theta_min      2.47
_cell_volume                     2987.1(2)
_computing_cell_refinement       'SAINT, Bruker'
_computing_data_collection       'SMART, Bruker'
_computing_data_reduction        'SAINT, Bruker'
_computing_molecular_graphics    'SHELXTL, Bruker'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0792
_diffrn_reflns_av_sigmaI/netI    0.0958
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       42
_diffrn_reflns_limit_l_min       -43
_diffrn_reflns_number            23918
_diffrn_reflns_theta_full        27.88
_diffrn_reflns_theta_max         27.88
_diffrn_reflns_theta_min         1.77
_exptl_absorpt_coefficient_mu    0.076
_exptl_absorpt_correction_T_max  0.9970
_exptl_absorpt_correction_T_min  0.9593
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
absorption correction applied using SADABS 
(Blessing, R. H. Acta Crystallogr., Sect. A 1995, 51, 33-3
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.147
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1128
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.45
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.737
_refine_diff_density_min         -0.555
_refine_diff_density_rms         0.068
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -1(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.042
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     312
_refine_ls_number_reflns         7134
_refine_ls_number_restraints     80
_refine_ls_restrained_S_all      1.182
_refine_ls_R_factor_all          0.1544
_refine_ls_R_factor_gt           0.1017
_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^)+(0.1363P)^2^+3.0093P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2608
_refine_ls_wR_factor_ref         0.2973
_reflns_number_gt                4424
_reflns_number_total             7134
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol060398psi20060215_032954.cif
_cod_data_source_block           7252
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1505934