In the presence of a catalytic amount of scandium triflate [Sc(OTf)3], 4-trifluoromethylbenzoylhydrazones reacted with silyl enolates to afford the corresponding adducts, β-N′-acylhydrazinocarbonyl compounds, in high yields. Reductive cleavage of the nitrogen-nitrogen bond of the hydrazino compounds was performed using Raney Ni under H2 atmosphere, to give β-aminocarbonyl compounds. The two-step process is regarded as a novel Mannich-type reaction using acylhydrazones as electrophiles. Moreover, the hydrazino compounds were also successfully converted to β-lactam, pyrazolidinone, and pyrazolone derivatives.
在催化量的三酸钪[Sc(OTf)3]存在下,4-三氟甲基苯甲酰肼与硅烯醇酯发生反应,得到相应的加合物δ-N′-酰肼羰基化合物,产量很高。在 H2 气氛下,使用 Raney Ni 对肼基化合物的氮-氮键进行还原裂解,得到δ-氨羰基化合物。这一两步反应被视为以酰基肼为亲电体的新型曼尼希式反应。此外,肼类化合物还成功地转化成了 δ-内酰胺、吡唑烷酮和吡唑酮衍生物。
Function regulator for retinoid relative receptor
申请人:——
公开号:US20040157881A1
公开(公告)日:2004-08-12
The present invention provides a retinoid-related receptor (except retinoic acid receptors) function regulating agent comprising a compound represented by the formula:
1
wherein one of R
1
and R
2
is an optionally substituted monocyclic aromatic hydrocarbon group or an optionally substituted monocyclic aromatic heterocyclic group containing one heteroatom, and the other is a hydrogen atom and the like; B is a 5- or 6-membered heterocycle (except 1,3-azole); A is an optionally substituted aromatic hydrocarbon group or an optionally substituted aromatic heterocyclic group; and R
3
is a hydrogen atom and the like, or a salt thereof, which is useful as an agent for the prophylaxis or treatment of diabetes mellitus, hyperlipidemia, impaired glucose tolerance or the like.
The present invention provides a retinoid-related receptor (except retinoic acid receptors) function regulatin agent comprising a compound represented by the formula:
wherein one of R1 and R2 is an optionally substituted monocyclic aromatic hydrocarbon group or an optionally substituted monocyclic aromatic heterocyclic group containing one heteroatom, and the other is a hydrogen atom and the like; B is a 5- or 6-membered heterocycle (except 1,3-azole); A is an optionally substituted aromatic hydrocarbon group or an optionally substituted aromatic heterocyclic group; and R3 is a hydrogen atom and the like, or a salt thereof, which is useful as an agent for the prophylaxis or treatment of diabetes mellitus, hyperlipidemia, impaired glucose tolerance or the like.
Three protocols for shotgun process are put forth in which simultaneous multi-fold reactions occur exclusively to each other. The first one involves simple combination of selective and non-selective reactions. Even if the simple protocol fails to give rise to the high selectivity, satisfactory outcome can be achieved by kinetic control or adjustment of functional groups. (C) 2003 Elsevier Science Ltd. All rights reserved.
Mannich Type Reactions of Acylhydrazones with Silyl Enolates for the Synthesis of b-Amino Ester, b-Amino Ketone, b-Lactam, Pyrazolidinone, and Pyrazolone Derivatives