246872-14-0Relevant articles and documents
NHC catalyzed enantioselective Coates-Claisen rearrangement: A rapid access to the dihydropyran core for oleuropein based secoiridoids
Vedachalam, Seenuvasan,Murugesh, Nithya,Chakraborty, Priyanka,Karvembu, Ramasamy,Liu, Xue-Wei
supporting information, p. 1832 - 1839 (2018/02/09)
We present the short synthesis of the suitably functionalized enantioselective dihydropyran core of secoiridoids using an N-heterocyclic carbene (NHC) catalyzed Coates-Claisen rearrangement mechanism. The key steps of the synthesis are (i) the highly enantioselective NHC catalyzed Coates-Claisen rearrangement for the dihydropyran core, (ii) the assembly of the target dihydropyran core structure of oleuropein from a highly diastereoselective exocyclic trans alkene, and (iii) the highly stereoselective assembly of a monoterpene elenolide core structure.
Preparation of primary amines by the alkylation of O-sulfonyloximes of benzophenone derivatives with Grignard reagents
Tsutsui, Hironori,Ichikawa, Tomoko,Narasaka, Koichi
, p. 1869 - 1878 (2007/10/03)
Primary amines are prepared by the electrophilic amination of Grignard reagents with benzophenone O-sulfonyloxime derivatives. 4,4'- Bis(trifluoromethyl)benzophenone O-sulfonyloximes react with alkyl Grignard reagents in the presence of a catalytic amount of CuCN in tetrahydrofuran- hexamethylphosphoric triamide to give N-alkylimines, which are readily hydrolyzed to primary amines. 3,3',5,5'-Tetrakis(trifluoromethyl)benzophenone O-p-tolylsulfonyloxime is arylated to the corresponding N-arylimines with aryl Grignard reagents in ether-toluene, and hydrolysis of the resulting imines gives aniline derivatives.