Synthesis of heterocyclic-fused benzopyrans via the Pd(<scp>ii</scp>)-catalyzed C–H alkenylation/C–O cyclization of flavones and coumarins
作者:Yechan Kim、Youngtaek Moon、Dahye Kang、Sungwoo Hong
DOI:10.1039/c4ob00180j
日期:——
derivatives. The synthetic utility of the one-pot sequence was demonstrated by obtaining convenient access to coumarin-annelated benzopyrans. The reaction scope for the transformation was found to be fairly broad, affording good yields of a wide range of flavone- or coumarin-fused benzopyran motifs, which are privileged structures in many biologically active compounds.
A new synthetic approach to hexahydroisoindol-4-ones is reported, based on the formal [3+2] cyclization reaction between N-arylsulfonylimines and cyclic conjugated dienes, under phosphine catalysis. Key substrates are 3-vinylcyclohex-2-enones with electron-withdrawing substituents (ester, amido, cyano, phosphoryl and keto groups) on the exocyclic doublebond, which afford the three-atom synthons for
Method of preparing oligomers of conjugated dienes with an iron-based catalyst composition
申请人:Bridgestone Corp.
公开号:US20030073570A1
公开(公告)日:2003-04-17
A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) (i) a halogen-containing iron compound or (ii) an iron-containing compound and a halogen-containing compound, (b) an &agr;-acylphosphonate diester, and (c) an organoaluminum compound.
一种催化剂组合物,它是由以下成分的组合或反应产物组成的:(a) (i) 含卤素的铁化合物或 (ii) 含铁化合物和含卤素的化合物,(b) &agr;-酰基膦酸二酯,和 (c) 有机铝化合物。
Iron-based catalyst composition for the manufacture of syndiotactic 1, 2-polybutadiene
申请人:Bridgestone Corp.
公开号:US20030073790A1
公开(公告)日:2003-04-17
A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) an iron-containing compound, (b) an &agr;-acylphosphonate diester, and (c) an organoaluminum compound.