81737-76-0Relevant academic research and scientific papers
HETEROYOHIMBINE ALKALOID SYNTHESIS
Jokela, Reija,Taipale, Tuula,Ala-Kaila, Kari,Lounasmaa, Mauri
, p. 2265 - 2271 (2007/10/02)
Preparation of the heteroyohimbine analogues 6 and 7 and a new short stereoselective total synthesis of (+/-)-3-iso-19-epiajmalicine 12 are described.
STEREOSELECTIVE TOTAL SYNTHESIS OF (+/-)-3-ISO-19-EPIAJMALICINE
Lounasmaa, Mauri,Jokela, Reija
, p. 2043 - 2044 (2007/10/02)
A new stereoselective three-step total synthesis of (+/-)-3-iso-19-epiajmalicine 4 starting from the easily accessible compound 1 is described.
Heteroyohimbine Alkaloids. Stereospecific Conversion of Ajmalicine into 19-Epiajmalicine
Palmisano, Giovanni,Danieli, Bruno,Lesma, Giordano,Riva, Renata
, p. 923 - 926 (2007/10/02)
An efficient four-step sequence to 19-epiajmalicine, a rare heteroyohimbane alkaloid, which requires mild conditions and utilises ajmalicine as an easily accessible starting material, is described.
GENERAL METHODS OF SYNTHESIS OF INDOLE ALKALOIDS - 14. SHORT ROUTES OF CONSTRUCTION OF YOHIMBOID AND AJMALICINOID ALKALOID SYSTEMS AND THEIR 13C NUCLEAR MAGNETIC RESONANCE SPECTRAL ANALYSIS.
Wenkert,Chang,Chawla,Cochran,Hagaman,King,orito
, p. 3645 - 3661 (2007/10/04)
Conceptually new schemes of synthesis of indole alkaloids are introduced. The yohimboid ring system is constructed by the sequential treatment of 1-tryptophyl-3-( beta -ketobutyl)pyridinium bromide with base and acid. Hydrogenation of the product yields d,l-pseudoyohimbone. The ajmalicinoid ring system is formed by the exposure of 1-tryptophyl-3-acetylpyridinium bromide to sodio dimethyl malonate and then to acid, followed by hydrogenation. Subsequent reduction and dehydration of the products lead to the racemates of the alkaloids tetrahydroalstonine and akuammigine as well as isomers of ajmalicine. Shifts of specific carbons are found to be of stereochemically diagnostic value.
