SINGLE STEP ENANTIOSELECTIVE PROCESS FOR THE PREPARATION OF 3-SUBSTITUTED CHIRAL PHTHALIDES
申请人:Council of Scientific & Industrial Research
公开号:US20140330027A1
公开(公告)日:2014-11-06
The present invention discloses single step, highly enantioselective catalytic oxidative cyclization process for the synthesis of 3-substituted chiral phthalides. In particular, the invention discloses asymmetric synthesis of chiral phthalides via synergetic nitrile accelerated oxidative cyclization of o-cyano substituted aryl alkenes in high yield and enantiomeric excess (ee) in short reaction time. Also, disclosed herein is “one-pot” asymmetric synthesis of biologically important natural compounds having 3-substituted chiral phthalide structural framework in the molecule.
[EN] A SINGLE STEP ENANTIOSELECTIVE PROCESS FOR THE PREPARATION OF 3-SUBSTITUTED CHIRAL PHTHALIDES<br/>[FR] PROCÉDÉ ÉNANTIOSÉLECTIF EN UNE SEULE ÉTAPE POUR LA PRÉPARATION DE PHTALIDES CHIRAUX 3-SUBSTITUÉS
申请人:COUNCIL SCIENT IND RES
公开号:WO2013072830A9
公开(公告)日:2014-02-20
US9073887B2
申请人:——
公开号:US9073887B2
公开(公告)日:2015-07-07
US9505733B2
申请人:——
公开号:US9505733B2
公开(公告)日:2016-11-29
CN-assisted oxidative cyclization of cyano cinnamates and styrene derivatives: a facile entry to 3-substituted chiral phthalides
作者:R. Santhosh Reddy、I. N. Chaithanya Kiran、Arumugam Sudalai
DOI:10.1039/c2ob25409c
日期:——
of o-cyano cinnamates and styrene derivatives leads to efficient construction of chiralphthalide frameworks in high optical purities. This unique reaction is characterized by unusual synergism between CN and osmate groups resulting in rate enhancement of the AD process. The method is amply demonstrated by the synthesis and the structural/stereochemical assignment of the natural products.