(3+2) Cycloaddition of N-methylazomethine ylide obtained from sarcosine and formaldehyde to CH- and NH-acidic enones and enamides
作者:Evgeny M. Buev、Vladimir S. Moshkin、Vyacheslav Ya. Sosnovskikh
DOI:10.1007/s10593-017-2035-7
日期:2017.2
Conjugatedunsaturatedcarbonylcompounds with weak CH or NH acidity were used in a three-component reaction with sarcosine and formaldehyde, forming (3+2) cycloaddition products in 32–73% yields. The conversion was estimated from NMR data and strongly depended on the acidity of dipolarophile and the steric accessibility of its double bond.
2-methylene-5-substituted-methylenecyclopentanone derivatives and use thereof
申请人:Zhao Linxiang
公开号:US08415505B2
公开(公告)日:2013-04-09
The invention relates to 2-methylene-5-substituted-methylenecyclopentanone derivatives of formula I, and the use thereof. The derivatives of formula I as active components are useful for preparing a medicine for the treatment and/or prevention of cancer diseases such as breast cancer, lung cancer, colon cancer, rectal cancer, stomach cancer, prostate cancer, bladder cancer, uterus cancer, pancreatic cancer and ovary cancer. The active compounds of the invention may be used as an anticancer drug alone or used in combination with one or more other antitumor drugs. A combined therapy can be carried out by administrating each therapeutic component concurrently, subsequently or separately.
Herein, we report an efficient iridium-catalyzed double asymmetrichydrogenation of 2,5-dialkylienecyclopentanones, delivering the chiral 2,5-disubstituted cyclopentanones in excellent yields and stereoselectivities. The results of the kinetic experiments and control experiments indicated that the two C═C bonds were hydrogenated in a stepwise manner and the second stereocenter was synergistically controlled
Conjugate Addition of Allyl Stannanes with Concomitant Triflation
作者:Ellen D. Beaulieu、Leah Voss、Dirk Trauner
DOI:10.1021/ol702996t
日期:2008.3.1
A new method for the conjugate addition of allyltributylstannane with concomitant triflation is described. This reaction works with functionalized enones, enals, enoates, and vinylogous esters. The resulting vinyl triflates can be used for intramolecular Heck reactions to afford the products of 5-exo-trig cyclization.