- Enantioselective synthesis of benzofurans and benzoxazines via an olefin cross-metathesis-intramolecular oxo-Michael reaction.
Enantioselective synthesis of benzofurans and benzoxazines via an olefin cross-metathesis-intramolecular oxo-Michael reaction.
Chemical communications (Cambridge, England) (2013-07-26)
Jun-Wei Zhang, Quan Cai, Qing Gu, Xiao-Xin Shi, Shu-Li You
PMID23884172
ABSTRACT
Chiral phosphoric acid and Hoveyda-Grubbs II were found to catalyze an olefin cross-metathesis-intramolecular oxo-Michael cascade reaction of the ortho-allylphenols and enones to provide a variety of benzofuran and benzoxazine derivatives in moderate to good yields and enantioselectivity.
MATERIALS
Product Number
Brand
Product Description
Sigma-Aldrich
Phosphoric acid solution, NMR reference standard, 85% in D2O (99.9 atom % D), NMR tube size 5 mm × 8 in.
Sigma-Aldrich
Phosphoric acid solution, NMR reference standard, 85% in D2O (99.9 atom % D), NMR tube size 3 mm × 8 in.
Sigma-Aldrich
Phosphoric acid solution, NMR reference standard, 85% in D2O (99.9 atom % D), NMR tube size 4.2 mm × 8 in. , WGS-5BL Coaxial NMR tube
Sigma-Aldrich
Phosphoric acid, puriss., meets analytical specification of Ph. Eur., BP, NF, FCC, 85.0-88.0%