Formal [4 + 1]- and [5 + 1]-annulation by an s(n)2-conjugate addition sequence: stereoselective synthesis of highly substituted carbocycles.
Tong, Benny Meng Kiat; Chen, Hui; Chong, Sin Yee; Heng, Yi Li; Chiba, Shunsuke; Organic letters 14 (2012) 2826–2829; doi:10.1021/ol301044e

data_1507739
_publ_contact_author
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Dr Shunsuke Chiba
Division of Chemistry and Biological Chemistry
School of Physical and Mathematical Sciences
Nanyang Technological University
21 Nanyang Link
Singapore 637371
Singapore
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_publ_section_title
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 Formal [4 + 1]- and [5 + 1]-annulation by an s(n)2-conjugate addition
 sequence: stereoselective synthesis of highly substituted carbocycles.
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_journal_issue                   11
_journal_name_full               'Organic letters'
_journal_page_first              2826
_journal_page_last               2829
_journal_paper_doi               10.1021/ol301044e
_journal_volume                  14
_journal_year                    2012
_chemical_formula_moiety         'C17 H18 N2 O2'
_chemical_formula_sum            'C17 H18 N2 O2'
_chemical_formula_weight         282.33
_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                 102.252(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.0332(5)
_cell_length_b                   6.9108(4)
_cell_length_c                   22.1287(12)
_cell_measurement_reflns_used    5280
_cell_measurement_temperature    103(2)
_cell_measurement_theta_max      31.08
_cell_measurement_theta_min      2.49
_cell_volume                     1499.40(14)
_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, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      103(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_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  0.0395
_diffrn_reflns_av_sigmaI/netI    0.0381
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            23354
_diffrn_reflns_theta_full        32.22
_diffrn_reflns_theta_max         32.22
_diffrn_reflns_theta_min         1.88
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.9723
_exptl_absorpt_correction_T_min  0.9676
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.251
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             600
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.36
_exptl_crystal_size_min          0.34
_refine_diff_density_max         0.530
_refine_diff_density_min         -0.308
_refine_diff_density_rms         0.120
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.069
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     191
_refine_ls_number_reflns         5277
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.069
_refine_ls_R_factor_all          0.0663
_refine_ls_R_factor_gt           0.0466
_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^)+(0.0740P)^2^+0.1796P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1226
_refine_ls_wR_factor_ref         0.1390
_reflns_number_gt                4009
_reflns_number_total             5277
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol301044e_si_005.cif
_cod_data_source_block           3la'
_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_sg_symbol_H-M      P2(1)/c
_cod_database_code               1507739