作者:Xuan B. Nguyen、Yuji Nakano、Nisharnthi M. Duggan、Lydia Scott、Martin Breugst、David W. Lupton
DOI:10.1002/anie.201905475
日期:2019.8.12
Direct polarity inversion of conjugate acceptors provides a valuable entry to homoenolates. N‐heterocyclic carbene (NHC) catalyzed reactions, in which β‐unsubstituted conjugate acceptors undergo homoenolate formation and C−C bond formation twice, have been developed. Specifically, the all‐carbon (5+1) annulations give a range of mono‐ and bicyclic cyclohexanones (31 examples). In the first family of
Efforts toward the total synthesis of a jatrophane diterpene
作者:Priya Mohan、Krishna Koushik、Michael J. Fuertes
DOI:10.1016/j.tetlet.2012.03.080
日期:2012.5
A significant effort toward the model study of jatrophane skeleton has been made. To synthesize an important synthon, Horner-Emmons-Wadsworth olefination was attempted. (C) 2012 Elsevier Ltd. All rights reserved.
Synthetic studies directed toward the total synthesis of a jatrophane diterpene
作者:Priya Mohan、Krishna Koushik、Michael J. Fuertes
DOI:10.1016/j.tetlet.2014.09.128
日期:2015.1
Jatrophanediterpenes are of significant biological importance as they have shown a remarkable potential as a Pgp inhibitor. These diterpenes have a characteristic framework. Synthesis of an advanced synthon was achieved in high yielding steps. The methyl group at C13 was installed using a zinc mediated crotylation. An alkoxy mediated hydrozirconation–iodination on propargylic alcohol to provide vinyl
Carboxylic acids and derivatives thereof and pharmaceutical compositions containing them
申请人:——
公开号:US20020049345A1
公开(公告)日:2002-04-25
The invention relates to carboxylic acids and derivatives thereof and pharmaceutical compound containing them. The active compounds are represented by the formula compound represented by formula I, wherin R
1
-R
4
each independently represents an unsubstituted or substituted hydrocarbyl or heterocyclyl radical, Q represents a diradical consisting of a linear chain of 11 to 18 carbon atoms, one or more of which may be replaced by heteroatoms, said chain being optionally substituted by inert substituents and one or more of said carbon or heteroatom chain members optionally forming part of a ring structure, and where one or both of de carboxyl groups can be substituted by an in vitro hydrolyzable physiologically acceptable substituent; with the proviso that: compounds wherein R
1
-R
4
each represents CH
3
and Q represents a linear chain of 14 carbons, are excluded; and compounds wherein Q represents a linear chain of carbon atoms one of which is replaced by oxygen or sulfur, are excluded.
1