Homologous Mukaiyama reactions via trapping of the Nazarov intermediate with silyloxyalkenes.
Wu, Yen-Ku; McDonald, Robert; West, F. G.; Organic letters 13 (2011) 3584–3587; doi:10.1021/ol201125h

data_1502243
_publ_section_title
;
 Homologous Mukaiyama reactions via trapping of the Nazarov intermediate
 with silyloxyalkenes.
;
_journal_issue                   14
_journal_name_full               'Organic letters'
_journal_page_first              3584
_journal_page_last               3587
_journal_paper_doi               10.1021/ol201125h
_journal_volume                  13
_journal_year                    2011
_chemical_formula_moiety         'C22 H24 O3'
_chemical_formula_sum            'C22 H24 O3'
_chemical_formula_weight         336.41
_chemical_name_systematic
'methyl (1,3-dimethyl-2-oxo-4,5-diphenylcyclopentyl)acetate'
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 98.5362(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.6158(5)
_cell_length_b                   10.8562(4)
_cell_length_c                   14.9637(6)
_cell_measurement_reflns_used    7875
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.35
_cell_measurement_theta_min      2.33
_cell_volume                     1866.07(13)
_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    'SHELXD (Schneider & Sheldrick, 2002)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_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  0.0158
_diffrn_reflns_av_sigmaI/netI    0.0128
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            16238
_diffrn_reflns_theta_full        27.54
_diffrn_reflns_theta_max         27.54
_diffrn_reflns_theta_min         2.08
_exptl_absorpt_coefficient_mu    0.078
_exptl_absorpt_correction_T_max  0.9827
_exptl_absorpt_correction_T_min  0.9696
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.197
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.36
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.312
_refine_diff_density_min         -0.173
_refine_diff_density_rms         0.034
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.065
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     226
_refine_ls_number_reflns         4289
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.065
_refine_ls_R_factor_all          0.0419
_refine_ls_R_factor_gt           0.0371
_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^)+(0.0472P)^2^+0.4804P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0976
_refine_ls_wR_factor_ref         0.1012
_reflns_number_gt                3783
_reflns_number_total             4289
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ol201125h_si_002.cif
_cod_data_source_block           3a
_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      'P 21/n'
_cod_database_code               1502243