New cyclopentane derivatives as inhibitors of steroid metabolizing enzymes AKR1C1 and AKR1C3
摘要:
A series of cyclopentane derivatives was synthesized and evaluated for inhibition of the steroid metabolizing enzymes AKR1C1 and AKR1C3. Selective inhibitors that are active in the low micromolar range were identified. These compounds represent promising starting points in the development of new anticancer agents for the treatment of hormone-dependent forms of cancer and other diseases where AKR1C1 and AKR1C3 are involved. (C) 2009 Elsevier Masson SAS. All rights reserved.
Synthesis and microbial transformation of β-amino nitriles
摘要:
Rhodococcus equi A4, Rhodococcus erythropolis NCIMB 11540 and Rhodococcus sp. R312 were investigated towards their ability to produce beta-amino amides and acids from beta-amino nitriles. The microorganisms show comparable trends: five-membered alicyclic 2-amino nitriles were transformed significantly faster than the six-membered compounds and the products of trans-2-amino nitriles (amides and acids) were formed considerably faster than the cis-counterparts (amides). The trans-five membered nitrites gave the amides (1b, 5b) in excellent enantiomeric excess (94-99%), the biotransformation of trans-six membered substrates resulted in the formation of the acid (3c, 7c) in excellent ee (87-99%). The ee's of the cis-compounds were throughout lower. Fifteen new substances were synthesized and characterized in the course of this work. (c) 2005 Elsevier Ltd. All rights reserved.
Polystyrene-supported TBD catalyzed ring-opening of N-tosylaziridines with silylated nucleophiles
作者:Satoru Matsukawa、Takeru Harada、Shiori Yasuda
DOI:10.1039/c2ob25435b
日期:——
Polystyrene-supported TBD (PS-TBD) catalyzes the ring-opening of N-tosylaziridines with silylated nucleophiles to give the corresponding products in high yields. PS-TBD was easily recovered and reused without significant loss of catalytic activity.
TBD-Catalyzed Ring Opening of Aziridines with Silylated Nucleophiles
作者:S. Matsukawa、H. Takahashi、T. Harada
DOI:10.1080/00397911.2011.601839
日期:2013.1
Abstract The ringopening of N-tosylaziridines with silylatednucleophiles catalyzed by 1,5,7-triazabicyclo[4,4,0]dec-5-ene (TBD) afforded the corresponding β-functionalized sulfonamides in excellent yields under mild reaction conditions. GRAPHICAL ABSTRACT
Do aziridines require Lewis acids for cleavage with ionic nucleophiles?
作者:Alakesh Bisai、Ghanshyam Pandey、Manoj K Pandey、Vinod K Singh
DOI:10.1016/s0040-4039(03)01414-x
日期:2003.7
variety of activatedaziridines were cleaved by sodium azide and sodium cyanide in aqueous acetonitrile at reflux, in the absence of any Lewisacid, to provide ring-opened products in quantitative yields. However, the reaction was sluggish in the ring opening of unactivated aziridines with sodium azide where the yields could be increased by adding 50 mol% CuCl2·2H2O. The reaction was used to synthesize
Lithium Perchlorate Catalyzed Regioselective Ring Opening of Aziridines with Sodium Azide and Sodium Cyanide
作者:Jhillu S. Yadav、Basi V. Subba Reddy、G. Parimala、P. Venkatram Reddy
DOI:10.1055/s-2002-35216
日期:——
Aziridines react smoothly with sodiumazide and sodium cyanide in the presence of catalytic amount of lithium perchlorate under essentially mild and neutral reaction conditions to afford the corresponding β-azido and β-cyaoamines in high yields with high regioselectivity.
Diastereoselective Photoredox-Catalyzed [3 + 2] Cycloadditions of <i>N</i>-Sulfonyl Cyclopropylamines with Electron-Deficient Olefins
作者:Dawn H. White、Adam Noble、Kevin I. Booker-Milburn、Varinder K. Aggarwal
DOI:10.1021/acs.orglett.1c00711
日期:2021.4.16
A highly diastereoselective, visible-light-induced [3 + 2] cycloaddition between N-sulfonyl cyclopropylamines and electron-deficient olefins is reported. The reactions proceed via the oxidation of a sulfonamide aza-anion by an organic photocatalyst to generate a nitrogen-centered radical. Strain-induced ring opening and intermolecular addition to the olefin generate an intermediate carbon-centered