Novel synthesis of pyrrolidinones by cobalt carbonyl catalyzed carbonylation of azetidines. A new ring-expansion-carbonylation reaction of 2-vinylazetidines to tetrahydroazepinones
作者:Dominique Roberto、Howard Alper
DOI:10.1021/ja00201a040
日期:1989.9
Pyrrolidinones can be synthesized in high yields and regioselectivity by the cobalt carbonyl catalyzed carbonylation of azetidines. For 2-substituted azetidines (alkyl, aryl, CH 2 OH, CH 2 OR, CH 2 OCOR, and COOR), carbonyl insertion occurs in the more or less substituted ring carbon-nitrogen bond depending on the kind of substituent group and on the reaction temperature. In the case of 2-vinylazetidines
There is disclosed are an enzyme preparation characterized by a polymer carrier having fine pores with average radius of 200-500 Å and the enzyme is capable of converting an N-substituted cyclic imino ester into an (S)—N-substituted cyclic imino acid, thereby an (S)—N-substituted cyclic imino acid is preferentially produced, and has an amino acid sequence as set forth in SEQ ID NO: 1 or the like.
本发明公开了一种酶制剂,其特征在于具有平均半径为200-500Å的细孔的聚合物载体,并且该酶能够将N-取代的环状亚氨酸酯转化为(S)-N-取代的环状亚氨酸,从而优先产生(S)-N-取代的环状亚氨酸,并具有SEQ ID NO:1或类似的氨基酸序列。
Esterase genes and uses of the same
申请人:Sumitomo Chemical Company, Limited
公开号:EP1057894A2
公开(公告)日:2000-12-06
The present invention provides a novel gene encoding a protein having an excellent catalyst ability for producing (S)-N-substituted cyclic imino acid represented by the general formula (2) (= the (S)-cyclic imino acid (2)):
and to provide a novel method for producing the (S)-cyclic imino acid (2) by an asymmetric hydrolization of the N-substituted cyclic imino acid ester represented by the general formula (1):
in a manner of gene engineering technology utilizing the novel gene provided.
The present invention provides a novel gene encoding a protein having an excellent catalyst ability for producing (S)-N-substituted cyclic imino acid represented by the general formula (2) (=the (S)-cyclic imino acid (2)):
1
and to provide a novel method for producing the (S)-cyclic imino acid (2) by an asymmetric hydrolization of the N-substituted cyclic imino acid ester represented by the general formula (1):
2
in a manner of gene engineering technology utilizing the novel gene provided.
Regiospecific and Stereospecific Palladium-Catalyzed Cycloaddition of Azetidines and Carbodiimides
作者:Jin-Ook Baeg、Corinne Bensimon、Howard Alper
DOI:10.1021/jo00106a043
日期:1995.1
Azetidines react with carbodiimides in the presence of bis(benzonitrile)palladium dichloride to form tetrahydropyrimidin-2-imines in 64-97% yields. The reaction is both regio- and stereospecific, the cycloaddition occurring with retention of configuration of the carbon centers bearing the substituent groups.