Lewis acid mediated reactions of 1-cyclopropyl-2-arylethanones with allenic esters: a facile synthetic protocol for the preparation of dihydrofuro[2,3-h]chromen-2-one derivatives.
Shi, Min; Tang, Xiang-Ying; Yang, Yong-Hua; Organic letters 9 (2007) 4017–4020; doi:10.1021/ol701713y

data_1505536
_publ_section_title
;
 Lewis acid mediated reactions of 1-cyclopropyl-2-arylethanones with
 allenic esters: a facile synthetic protocol for the preparation of
 dihydrofuro[2,3-h]chromen-2-one derivatives.
;
_journal_issue                   20
_journal_name_full               'Organic letters'
_journal_page_first              4017
_journal_page_last               4020
_journal_paper_doi               10.1021/ol701713y
_journal_volume                  9
_journal_year                    2007
_chemical_formula_sum            'C20 H17 Cl O3'
_chemical_formula_weight         340.79
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                74.717(3)
_cell_angle_beta                 80.936(4)
_cell_angle_gamma                82.909(3)
_cell_formula_units_Z            2
_cell_length_a                   6.8783(12)
_cell_length_b                   10.2073(18)
_cell_length_c                   12.061(2)
_cell_measurement_reflns_used    1116
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      49.235
_cell_measurement_theta_min      6.020
_cell_volume                     803.7(2)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.985
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0828
_diffrn_reflns_av_sigmaI/netI    0.0748
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            4224
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.08
_exptl_absorpt_coefficient_mu    0.253
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.75259
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.408
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             356
_exptl_crystal_size_max          0.506
_exptl_crystal_size_mid          0.328
_exptl_crystal_size_min          0.137
_refine_diff_density_max         0.463
_refine_diff_density_min         -0.629
_refine_diff_density_rms         0.076
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.007
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     220
_refine_ls_number_reflns         2947
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.010
_refine_ls_R_factor_all          0.1176
_refine_ls_R_factor_gt           0.0855
_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^)+(0.1778P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2556
_refine_ls_wR_factor_ref         0.2846
_reflns_number_gt                1720
_reflns_number_total             2947
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol701713y-file001.cif
_cod_data_source_block           cd2675
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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-1
_cod_database_code               1505536