Asymmetric construction of dihydrobenzofuran-2,5-dione derivatives <i>via</i> desymmetrization of <i>p</i>-quinols with azlactones
作者:Lihua Xie、Shunxi Dong、Qian Zhang、Xiaoming Feng、Xiaohua Liu
DOI:10.1039/c8cc08985j
日期:——
3-Amino-benzofuran-2,5-diones containing a chiral amino acid residue were achieved through BG-1·HBPh4 catalyzed enantioselective Michael addition/lactonization cascade reaction of p-quinols with azlactones.
Asymmetric [4+2] cycloaddition of azlactones with dipolar copper–allenylidene intermediates for chiral 3,4-dhydroquinolin-2-one derivatives
作者:Bing-Bing Sun、Qing-Xian Hu、Jia-Ming Hu、Jie-Qiang Yu、Jun Jia、Xing-Wang Wang
DOI:10.1016/j.tetlet.2019.06.041
日期:2019.7
provides optically active 3,4-dihydroquinolin-2-ones in high yields with good enantioselectivities and diastereoselectivities. In this transformation, the chiral dipolar copper–allenylidene intermediates are kinetically generated via decarboxylative ethynyl benzoxazinanones, followed by the attack of the enolate azlactones to form enantiomerically enriched 3,4-dihydroquinolin-2-one structures.
Enantioselective Addition of Azlactones to Ethylene Sulfonyl Fluoride via Dual Catalysis
作者:Dong-yu Zhu、Xue-jing Zhang、Ming Yan
DOI:10.1021/acs.orglett.1c01193
日期:2021.6.4
Enantioselective conjugate addition of azlactones to ethylene sulfonyl fluoride has been achieved via the cooperative catalysis with (DHQD)2PHAL and a hydrogen-bond donor (HBD). This approach furnishes a facile access to a range of structurally diverse azlactone sulfonyl fluoride derivatives with good to excellent yields and enantioselectivities. The combination of azlactone and sulfonyl fluoride group
Catalytic asymmetric formal [3+2] cycloaddition of isatogens with azlactones to construct indolin-3-one derivatives
作者:Lihua Xie、Yi Li、Shunxi Dong、Xiaoming Feng、Xiaohua Liu
DOI:10.1039/d0cc06418a
日期:——
A number of enantioenriched indolin-3-one derivatives were readily obtained by chiral guanidine-catalyzed [3+2] cycloaddition of isatogens with azlactones.
Novel synthesis of (S)-1-[5-(benzoylamino)-1,4-dioxo-6-phenylhexyl]-L-proline and analogs: potent angiotensin converting enzyme inhibitors
作者:Robert F. Meyer、Ernest D. Nicolaides、Francis G. Tinney、Elizabeth A. Lunney、Ann Holmes、Milton L. Hoefle、Ronald D. Smith、Arnold D. Essenburg、Harvey R. Kaplan、Ronald G. Almquist
DOI:10.1021/jm00140a010
日期:1981.8
in vitro angiotensinconvertingenzyme (ACE) inhibitory activity of 1 was confirmed. Some of the novel analogues (6, 11, 13, and 17) were also found to be potentinhibitors of ACE in vitro with an IC50 of 1.4-8.8 x 10(-9) M (IC50 for captopril = 0.9 x 10(-8) M). In vivo these compounds (6, 11, 17, and 18) were much less active than captopril, especially by the oral route. Against angiotensin I (AI) challenge
开发了一种新的合成(S)-1- [5-(苯甲酰氨基)-1,4-二氧代-6-苯基己基] -L-脯氨酸(1)和23种类似物的方法。δ-(酰基氨基)-γ-酮酸中间体是使用3-羰基甲氧基丙酰氯通过改良的Dakin-West反应获得的。L-脯氨酸的酰化和非对映异构体混合物的重结晶在三个反应步骤中得到光学纯的标题化合物。证实了体外血管紧张素转化酶(ACE)的抑制活性为1。还发现一些新型类似物(6、11、13和17)是体外有效的ACE抑制剂,IC50为1.4-8.8 x 10(-9)M(卡托普利的IC50 = 0.9 x 10(- 8)M)。在体内,这些化合物(6、11、17和18)的活性比卡托普利低得多,尤其是通过口服途径。针对血压正常的大鼠的血管紧张素I(AI)攻击,1和6在30 mg / kg口服时产生小于50%的抑制,但是在3 mg / kg iv下产生57至82%的抑制。两种途径的抑制持续不到