Asymmetric synthesis of (+)-loline, a pyrrolizidine alkaloid from rye grass and tall fescue
Blakemore, Paul R.; Kim, Sung-Kee; Schulze, Volker K.; White, James D.; Yokochi, Alexandre F. T.; Journal of the Chemical Society, Perkin Transactions 1  (2001) 1831–; doi:10.1039/b103936a

data_7216882
_publ_section_title
;
 Asymmetric synthesis of (+)-loline, a pyrrolizidine alkaloid from rye
 grass and tall fescue
;
_journal_issue                   15
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 1'
_journal_page_first              1831
_journal_paper_doi               10.1039/b103936a
_journal_year                    2001
_chemical_formula_sum            'C15 H24 B N O4'
_chemical_formula_weight         293.16
_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                   8.480(1)
_cell_length_b                   9.322(2)
_cell_length_c                   20.143(3)
_cell_measurement_reflns_used    65
_cell_measurement_temperature    290(2)
_cell_measurement_theta_max      26.485
_cell_measurement_theta_min      7.252
_cell_volume                     1592.3(5)
_computing_cell_refinement       'XSCANS V2.20'
_computing_data_collection       'XSCANS V2.20'
_computing_data_reduction        'XSCANS V2.20'
_computing_molecular_graphics    'ORTEP-III for windows'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      290(2)
_diffrn_measured_fraction_theta_full 0.967
_diffrn_measured_fraction_theta_max 0.968
_diffrn_measurement_device_type  'Siemens P4'
_diffrn_measurement_method       '\w/2\q scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0690
_diffrn_reflns_av_sigmaI/netI    0.0361
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            3209
_diffrn_reflns_theta_full        67.80
_diffrn_reflns_theta_max         67.80
_diffrn_reflns_theta_min         4.39
_diffrn_standards_decay_%        none
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.702
_exptl_absorpt_correction_T_max  0.9331
_exptl_absorpt_correction_T_min  0.7665
_exptl_absorpt_correction_type   Psi-scans
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.223
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             632
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.127
_refine_diff_density_min         -0.117
_refine_diff_density_rms         0.032
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.1(3)
_refine_ls_extinction_coef       0.0010(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.080
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     217
_refine_ls_number_reflns         2654
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.080
_refine_ls_R_factor_all          0.0447
_refine_ls_R_factor_gt           0.0362
_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^)+(0.0357P)^2^+0.3230P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0866
_refine_ls_wR_factor_ref         0.0955
_reflns_number_gt                2320
_reflns_number_total             2654
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b103936a.txt
_cod_data_source_block           pb092599
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_sg_symbol_H-M      'P 2(1) 2(1) 2(1)'
_cod_database_code               7216882