Stereoselective construction of an unprecedented 7-8 fused ring system in micrandilactone a by [3,3]-sigmatropic rearrangement.
Zhang, Yan-Dong; Ren, Wei-Wu; Lan, Yu; Xiao, Qing; Wang, Kai; Xu, Jie; Chen, Jia-Hua; Yang, Zhen; Organic letters 10 (2008) 665–668; doi:10.1021/ol703126q

data_1504564
_publ_section_title
;
 Stereoselective construction of an unprecedented 7-8 fused ring system in
 micrandilactone a by [3,3]-sigmatropic rearrangement.
;
_journal_issue                   4
_journal_name_full               'Organic letters'
_journal_page_first              665
_journal_page_last               668
_journal_paper_doi               10.1021/ol703126q
_journal_volume                  10
_journal_year                    2008
_chemical_formula_moiety         'C21 H25 N O5'
_chemical_formula_sum            'C21 H25 N O5'
_chemical_formula_weight         371.42
_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                 95.181(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.6159(12)
_cell_length_b                   14.929(2)
_cell_length_c                   15.652(2)
_cell_measurement_reflns_used    48
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      14.40
_cell_measurement_theta_min      2.61
_cell_volume                     2005.0(5)
_computing_cell_refinement       'XSCANS (Bruker, 1997)'
_computing_data_collection       'XSCANS (Bruker, 1997)'
_computing_data_reduction        'XSCANS (Bruker, 1997)'
_computing_molecular_graphics    'SHELXTL (Bruker, 1997)'
_computing_publication_material  'SHELXTL (Bruker, 1997)'
_computing_structure_refinement  'SHELXTL (Bruker, 1997)'
_computing_structure_solution    'SHELXTL (Bruker, 1997)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Bruker P4'
_diffrn_measurement_method       '\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  0.0575
_diffrn_reflns_av_sigmaI/netI    0.0824
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            4631
_diffrn_reflns_theta_full        25.10
_diffrn_reflns_theta_max         25.10
_diffrn_reflns_theta_min         1.89
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.230
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             792
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.209
_refine_diff_density_min         -0.234
_refine_diff_density_rms         0.071
_refine_ls_extinction_coef       0.0127(7)
_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   0.987
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     245
_refine_ls_number_reflns         3529
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.987
_refine_ls_R_factor_all          0.1562
_refine_ls_R_factor_gt           0.0469
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0010P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0805
_refine_ls_wR_factor_ref         0.1072
_reflns_number_gt                1202
_reflns_number_total             3529
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ol703126q-file003.cif
_cod_data_source_block           yangz-1
_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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        2005.1(5)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               1504564