Process for preparing 1,2,4-Thiadiazole Derivatives
申请人:KATAYAMA SEIYAKUSYO CO. Ltd.
公开号:EP0536900A2
公开(公告)日:1993-04-14
Reaction of a 2-aminoisoxazole (A, where X is H or OR1) with a thiocyanate and an acyl halide (or their reaction product) and rearrangement of the product gives a 1,2,4-thiadiazole compound (B or C):
The compound B (X=H) can be oxidised and esterified to obtain C (X=OR1). The 3-substituent of compound C (-CH2.CO2R1) may be converted into
The thiadiazole compounds may be used to prepare acylating agents for preparation of therapeutically useful 7-acylaminocephalosporins.
将 2-氨基异噁唑(A,其中 X 为 H 或 OR1)与硫氰酸盐和酰基卤化物(或其反应产物)反应,并对产物进行重排,可得到 1,2,4-噻二唑化合物(B 或 C):
化合物 B(X=H)经氧化和酯化可得到 C(X=OR1)。化合物 C 的 3-取代基(-CH2.CO2R1)可转化为-CH2.CO2R2。
噻二唑化合物可用于制备酰化剂,以制备对治疗有用的 7-酰氨基头孢菌素。
A practical preparation of (Z)-2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(methoxyimino)acetic acid
A Z-isomer of 2-(5-amino- 1,2,4-thiadiazol-3-yl)-2-(methoxyimino)acetic acid, which is the common acyl moiety of clinically useful cephalosporins, has been prepared from the aminoisoxazols through the thiadiazol-acetate in two pathways.
US5585494A
申请人:——
公开号:US5585494A
公开(公告)日:1996-12-17
US5705650A
申请人:——
公开号:US5705650A
公开(公告)日:1998-01-06
[EN] PIPERAZINE DERIVATIVES USEFUL AS HYPOGLYCEMIC AGENTS<br/>[FR] DERIVES DE PIPERAZINE POUVANT ETRE UTILISES COMME AGENTS HYPOGLYCEMIQUES
申请人:SHAMAN PHARMACEUTICALS, INC.
公开号:WO1999031096A1
公开(公告)日:1999-06-24
(EN) Piperazine derivatives useful as antihyperglycemic agents, pharmaceutical compositions comprising the piperazine derivatives and methods for their use are described. The piperazine derivatives are useful for the treatment of insulin-dependent diabetes mellitus (IDDM or Type I) and non-insulin dependent diabetes mellitus (NIDDM or Type II).(FR) L'invention concerne des dérivés de pipérazine présentant une grande utilité comme agents antihyperglycémiques. L'invention traite également de compositions pharmaceutiques comprenant des dérivés de pipérazine et des procédés d'utilisation de ces derniers. Les dérivés de pipérazine permettent de traiter le diabète sucré insulinodépendant (ou de type I) et le diabète sucré non insulinodépendant (ou de type II).