An efficient Ni–(S,S)-Ph-BPE complex that catalyzed asymmetrichydrogenation of cyclic N-acyl hydrazones has been developed to produce various chiral cyclic hydrazines in high yields with excellent enantioselectivities of up to >99% enantiomeric excess. Moreover, the hydrogenation can not only proceed smoothly on a gram scale under lower catalyst loading (S/C = 3000) without any decrease of enantioselectivity
已开发出一种高效的 Ni-( S , S )-Ph-BPE 络合物,可催化环状N-酰基腙的不对称氢化,以高产率生产各种手性环状肼,具有高达 >99% 对映体过量的出色对映选择性。此外,氢化不仅可以在较低的催化剂负载量(S/C = 3000)下顺利进行,而且对映选择性没有任何降低,而且还可以应用于 RIP-1 激酶抑制剂的不对称合成。
Antibiotic derivatives, their production and use
申请人:Takeda Chemical Industries, Ltd.
公开号:EP0219923A1
公开(公告)日:1987-04-29
The compound represented by the formula:
where R' stands for amino or an organic residue bonded through nitrogen; R2 stands for carooxyl ora group derivable therefrom; R3, R4, R5, R6, R7 and R8 independently stand for hydrogen or an organic residue, including the case where R5 or R6 forms a chemical bond or a ring with R7 or R8: X stands for hvdrogen, methoxy or formylamino; or a salt thereof, pro- duceaole by the present method. exnibits excellent antimicrobial activity, and is utilized as antimicrobial agents.
Tricyclic penam compounds, their production and their use
申请人:Takeda Chemical Industries, Ltd.
公开号:EP0249909A1
公开(公告)日:1987-12-23
The compounds, having a 4,10-dioxo-3-oxa-7-thia-1- azatricyclo[6,2,0,02,6]decane-2-carboxylic acid skeleton as the base structure,
their esters and their salts, are useful antibacterial agents.
Tricyclic cepham compounds, their production and use
申请人:Takeda Chemical Industries, Ltd.
公开号:EP0253337A2
公开(公告)日:1988-01-20
The compounds having a 4,11-dioxo-3-oxa8(or 7)-thia-1- azatricyclo[7,2,0,02,6]undecane-2-carboxylic acid skeleton as the base structure, their esters and their salts are useful antibacterial agents.
Gamma-lactonecarboxylic acid derivatives and their production
申请人:Takeda Chemical Industries, Ltd.
公开号:EP0266182A2
公开(公告)日:1988-05-04
A compound represented by formula (I):
, wherein R¹ is an organic residue through a carbon atom, R² is a carboxyl group which may be esterified or amidated, and X is an oxygen atom, or a sulfur atom which may be oxidized,
or a salt thereof, which is useful as antibacterial agent or intermediate for synthesizing the same, and a process for preparing the same.