Reversal of nucleophilicity of enamides in water: control of cyclization pathways by reaction media for the orthogonal synthesis of dihydropyridinone and pyrrolidinone Clausena alkaloids.
Yang, Luo; Zheng, Qi-Yu; Wang, De-Xian; Huang, Zhi-Tang; Wang, Mei-Xiang; Organic letters 10 (2008) 2461–2464; doi:10.1021/ol800740h

data_1504693
_publ_section_title
;
 Reversal of nucleophilicity of enamides in water: control of cyclization
 pathways by reaction media for the orthogonal synthesis of
 dihydropyridinone and pyrrolidinone Clausena alkaloids.
;
_journal_issue                   12
_journal_name_full               'Organic letters'
_journal_page_first              2461
_journal_page_last               2464
_journal_paper_doi               10.1021/ol800740h
_journal_volume                  10
_journal_year                    2008
_chemical_formula_moiety         'C18 H19 N O3'
_chemical_formula_sum            'C18 H19 N O3'
_chemical_formula_weight         297.34
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 91.32(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.922(3)
_cell_length_b                   6.8246(14)
_cell_length_c                   13.777(3)
_cell_measurement_reflns_used    657
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.17
_cell_volume                     1496.6(5)
_computing_cell_refinement       'Rapid Auto(Rigaku 2001)'
_computing_data_collection       'Rapid Auto(Rigaku 2001)'
_computing_data_reduction        'Rapid Auto(Rigaku 2001)'
_computing_molecular_graphics    'XP in Siemens SHELXTL (Sheldrick, 1994)'
_computing_publication_material  'SHELX97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Rigaku raxis Rapid IP Area Detector'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0313
_diffrn_reflns_av_sigmaI/netI    0.0438
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            4919
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.56
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_T_max  0.9867
_exptl_absorpt_correction_T_min  0.9582
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'ABSCOR by T.Higashi    8 March, 1995'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.320
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             632
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.316
_refine_diff_density_min         -0.272
_refine_diff_density_rms         0.048
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.174
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     199
_refine_ls_number_reflns         2627
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.174
_refine_ls_R_factor_all          0.0775
_refine_ls_R_factor_gt           0.0592
_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^)+(0.0519P)^2^+0.7176P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1215
_refine_ls_wR_factor_ref         0.1285
_reflns_number_gt                2238
_reflns_number_total             2627
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol800740h-file004.cif
_cod_data_source_block           a
_cod_original_cell_volume        1496.7(5)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               1504693