Small organic molecule catalyzed enantioselective direct aldol reaction in water
摘要:
Protonated pyrrolidine based small organic molecules have been designed and evaluated for the asymmetric direct aldol reaction in water. The designed organocatalysts are multifunctional in nature and exploit the combined effect of hydrogen bonding and hydrophobic interactions for enantioselective catalysis in water. As a result a unique direct asymmetric aldol reaction in water catalyzed by a small organic molecule having an amide linkage has been developed. The developed catalyst affords chiral beta-hydroxyketones in good yields (93%) and enantioselectivities (upto 62%) in water. (c) 2006 Elsevier Ltd. All rights reserved.
4-Substituted-2-azetidinone compound, process of producing the
申请人:Yamanouchi Pharmaceutical Co., Ltd.
公开号:US04564609A1
公开(公告)日:1986-01-14
A novel 4-substituted-2-azetidinone compound shown by the general formula ##STR1## and salts thereof. The compounds of this invention have a strong CNS activity and are useful for improving a disturbance of consciousness in schizophrenia, a head injury, etc., or improving hypobulia, memory loss, etc.
A novel peptide of the formula: ##STR1## wherein A is hydrogen, alkyl, aralkyl, alkoxyalkyl, hydroxyalkyl or alkoxy; R is ##STR2## X is --S-- or --(CH.sub.2).sub.n -- where n is 1 or 2 has a weaker TRH releasing activity than TRH and a stronger anaesthesia-antagonistic activity, spontaneous movement-stimulant activity or dopamine-potentiating activity than TRH.
A novel-4-substituted-2-azetidinone compound shown by the general formula ##STR1## and salts thereof. The compounds of this invention have a strong CNS activity and are useful for improving a disturbance of consciousness in schizophrenia, a head injury, etc., or improving hypobulia, memory loss, etc.
4-substituted-2-azetidinone compound, process of producing the
申请人:Yamanouchi Pharmaceutical Co., Ltd.
公开号:US04610821A1
公开(公告)日:1986-09-09
A novel 4-substituted-2-azetidinone compound shown by the general formula ##STR1## and salts thereof. The compounds of this invention have a strong CNS activity and are useful for improving a disturbance of consciousness in shizophrenia, a head injury, etc., or improving hypobulia, memory loss, etc.