The Garuganin and Garugamblin Diarylether Heptanoids: Total Synthesis and Determination of Chiral Properties Using Dynamic NMR
摘要:
The synthesis of the garuganin and garugamblin diarylether heptanoids using an intramolecular Ullmann coupling is reported. Alkene stereoisomers, vinylogous ester regioisomers, and beta-diketone congeners are also synthesized. The chiral properties and free energies of activation for racemization of the garuganin and garugamblin diarylether heptanoids and congeners are determined using dynamic NMR methods. A combination of techniques including coalescence measurements, line shape analysis, and selective inversion experiments are used to measure racemization barriers. None of the garuganin or garugamblin diarylether heptanoids are chiral, despite their reported specific rotation values.
Process for production of aspartyl dipeptide ester derivative, novel production intermediate therefor, and process for production thereof
申请人:AJINOMOTO CO. INC
公开号:US20020133037A1
公开(公告)日:2002-09-19
The present invention relates to a method of manufacturing aspartyl dipeptide ester compounds, which can be used as sweeteners, and aldehydes that can be used in the manufacturing processes.
NOVEL ASPARTYL DIPEPTIDE ESTER DERIVATIVES AND SWEETENERS
申请人:Ajinomoto Co., Inc.
公开号:EP1088829A1
公开(公告)日:2001-04-04
There are provided novel aspartyl dipeptide ester derivatives (including salts thereof) such as N-[N-[3-(3-hydroxy-4-methoxyphenyl)propyl]-L-α-aspartyl]-L-(α-methyl)phenylalanine 1-methyl ester which are usable as sweeteners, and sweeteners, foods and the like containing the same.
These derivatives are usable as low-calory sweeteners especially excellent in the degree of sweetness in comparison with the conventional products.
PROCESS FOR THE PRODUCTION OF ASPARTYLDIPEPTIDE ESTER DERIVATIVES, NOVEL INTERMEDIATES THEREFOR AND PROCESS FOR THE PRODUCTION OF THE INTERMEDIATES
申请人:Ajinomoto Co., Inc.
公开号:EP1231215A1
公开(公告)日:2002-08-14
In the present invention, efficient and industrial processes for production of aspartyl dipeptide ester derivative represented by the general formula (3) expected to serve as a sweetener, and aldehydes represented by the general formulae (1) and (2) which are intermediates therefor are provided.
Among them, a process for producing industrially and efficiently N-[N-[3-(3-hydroxy-4-methoxyphenyl) propyl]-L-α-aspartyl]-L-phenylalanine 1-methyl ester particularly excellent as a sweetener having a high sweetening potency, a development of intermediate for the production particularly useful and advantageous therefor, and an efficient process for production thereof are provided.