Asymmetric Hydrogenation of Itaconic Acid and Enol Acetate Derivatives with the Rh-TangPhos Catalyst
作者:Wenjun Tang、Duan Liu、Xumu Zhang
DOI:10.1021/ol0272592
日期:2003.1.1
[reaction: see text] The Rh-TangPhos catalyst has been used for asymmetrichydrogenation of itaconic acid and enol acetate derivatives. A variety of chiral 2-substituted succinic acids and chiral acetates have been obtained in excellent ee values (up to 99% ee).
2-piperazinone-1-acetic acid derivatives and their use
申请人:Takeda Chemical Industries, Ltd.
公开号:US06242600B1
公开(公告)日:2001-06-05
The present invention provides compounds and medicines effective for prophylaxis and therapy of various diseases by controlling or inhibiting cell-adhesion. Especially, the compounds of this invention inhibit platelet aggregation action without remarkable elongation of hemorrhagic period and can be used as a safe and long-acting antithrombotic drug as compared with known substances showing the same activity.
Compounds of this invention are piperazinones of the formula:
wherein the ring A is a basic heterocyclic group; the ring B is a nitrogen containing heterocyclic group or a cyclic hydrocarbon group; Y is CH2; R1 is H, OH, NH2 or an hydrocarbon group which may be bound through CO, S, SO or SO2; R2 is H or a hydrocarbon group; R3 is an optionally esterified or amidated carboxyl group; and D is a lower alkyl group substituted with an optionally esterified carboxyl group; or a salt thereof.
Design and Synthesis of Novel Arctigenin Analogues for the Amelioration of Metabolic Disorders
作者:Shudong Duan、Suling Huang、Jian Gong、Yu Shen、Limin Zeng、Ying Feng、Wenming Ren、Ying Leng、Youhong Hu
DOI:10.1021/acsmedchemlett.5b00007
日期:2015.4.9
compounds. The structure–activity relationship study led to the discovery of key substitution patterns on the lactone motif that govern 2-deoxyglucose uptake activities. The results show that replacement of the para-hydroxyl group of the C-2 benzyl moiety of arctigenin by Cl has a pronounced effect on uptake activity. Specifically, analogue 2p, which contains the p-Cl substituent, stimulates glucose uptake
Reductivemethylation of the naphthoicesters (3), (9), (13), and (15) was carried out in distilled liquid ammonia in the presence of sodium to give the esters (19), (20), (21), and (22), respectively.