Regiospecific Ficini [2 + 2] Cycloaddition of Ynamides with Cyclic Isoimidium Salts under Catalyst-Free Conditions.
Yuan, Yini; Bai, Lu; Nan, Jiang; Liu, Jingjing; Luan, Xinjun; Organic letters 16 (2014) 4316–4319; doi:10.1021/ol5020587

data_1517503
_publ_section_title
;
 Regiospecific Ficini [2 + 2] Cycloaddition of Ynamides with Cyclic
 Isoimidium Salts under Catalyst-Free Conditions.
;
_journal_issue                   16
_journal_name_full               'Organic letters'
_journal_page_first              4316
_journal_page_last               4319
_journal_paper_doi               10.1021/ol5020587
_journal_volume                  16
_journal_year                    2014
_chemical_formula_sum            'C31 H34 N2 O5 S'
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_chemical_name_systematic
;
 ?
;
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_symmetry_space_group_name_Hall  '-P 1'
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_diffrn_reflns_point_group_measured_fraction_full 0.980
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_refine_ls_extinction_method     none
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_refine_ls_hydrogen_treatment    constr
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_refine_ls_number_reflns         6900
_refine_ls_number_restraints     0
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_refine_ls_R_factor_all          0.1428
_refine_ls_R_factor_gt           0.0840
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 w=1/[\s^2^(Fo^2^)+(0.2000P)^2^]
 where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
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_reflns_threshold_expression     'I > 2\s(I)'
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