Novel Brønsted Acid Catalyzed Three-Component Alkylations of Indoles with N-Phenylselenophthalimide and Styrenes
摘要:
Novel and efficient Bronsted acid (p-TsOH) catalyzed inter- and intramolecular Friedel-Crafts alkylations have been developed to synthesize selenated three-component coupling and selenation-cyclization indole derivatives. Chemical removal of the phenylseleno moiety was investigated, and the reaction mechanisms were discussed.
The use of an equimolar amount of pyrrolidine and HClO4 (30 mol%) was found to be effective in promoting the conjugate addition of indoles to (E)-alpha,beta-unsaturated ketones, affording the corresponding beta-indolyl ketones in excellent yields.
KUCHKOVA K. I.; STYNGACH E. P.; RIVILIS F. SH.; FROLOVA N. M.; CEMEHOB A.+, XIMIYA GETEROTSIKL. SOEDIN. <KGSS-AQ>, 1976, HO 3, 386-391
作者:KUCHKOVA K. I.、 STYNGACH E. P.、 RIVILIS F. SH.、 FROLOVA N. M.、 CEMEHOB A.+
DOI:——
日期:——
High-Pressure Accelerated Asymmetric Organocatalytic Friedel–Crafts Alkylation of Indoles with Enones: Application to Quaternary Stereogenic Centers Construction
organocatalytic Friedel–Craftsalkylation of indoles with α,β-unsaturated ketones was found to be efficiently accelerated under high-pressure conditions with a low loading of chiral primary amine salts with good yield and enantioselectivity up to 90%. This approach also allows, for the first time, selected indole derivatives containing quaternary stereogenic centers to be obtained from prochiral β,β-disubstituted
Novel and efficient Bronsted acid (p-TsOH) catalyzed inter- and intramolecular Friedel-Crafts alkylations have been developed to synthesize selenated three-component coupling and selenation-cyclization indole derivatives. Chemical removal of the phenylseleno moiety was investigated, and the reaction mechanisms were discussed.