Biosynthesis of (+)-cubenene and (+)-epicubenol by cell-free extracts of cultured cells of Heteroscyphus planus and cyclization of [2H]farnesyl diphosphates
The absolute stereochemistry of cubenene and epicubenol from cultured cells of Heteroscyphus planus was determined as both (+)-isomers by H-1 and C-13 NMR spectroscopy, GLC using a chiral capillary column, and optical rotations. Incubation of two geometrical isomers of deuteriated farnesyl diphosphate (FPP) with a cell-free extract from cultured cells indicated that both compounds were specifically formed from (2E,6E)-FPP. Gas-liquid chromatography-mass spectrometry (GLC-MS) and H-2 NMR analyses of(+)-cubenene and (+)-epicubenol generated from [1,1-H-2(2)]- and [6-H-2]-FPP confirmed the presence of 1,2- and 1,3-hydride shifts in their formation.
CANE, DAVID E.;OLIVER, JOHN S.;HARRISON, PAUL H. M.;ABELL, CHRISTOPHER;HU+, J. AMER. CHEM. SOC., 112,(1990) N1, C. 4513-4524
作者:CANE, DAVID E.、OLIVER, JOHN S.、HARRISON, PAUL H. M.、ABELL, CHRISTOPHER、HU+
DOI:——
日期:——
HARRISON, PAUL H. M.;OLIVER, JOHN S.;CANE, DAVID E., J. AMER. CHEM. SOC., 110,(1988) N 17, C. 5922-5923
作者:HARRISON, PAUL H. M.、OLIVER, JOHN S.、CANE, DAVID E.
DOI:——
日期:——
Convenient synthesis of deuterium labelled sesquiterpenes
Despite their apparent importance, the limited number of commercial standards has hindered their study and precise quantification. Herein, we report the syntheses of fourteen labelled sesquiterpenes with a high level of deuterium incorporation (>95%) for applications in MS-based studies.
Cyclization Mechanism of Amorpha-4,11-diene Synthase, a Key Enzyme in Artemisinin Biosynthesis
作者:Soon-Hee Kim、Keon Heo、Yung-Jin Chang、Si-Hyung Park、Sang-Ki Rhee、Soo-Un Kim
DOI:10.1021/np050356u
日期:2006.5.1
3-hydride shift or two successive 1,2-shifts, and one involving a germacrenyl carbocation, were proposed and tested by analyzing the fate of farnesyl diphosphate H-1 hydrogen atoms through (1)H and (2)HNMR spectroscopy. Migration of one deuterium atom of [1,1-(2)H(2)]farnesyl diphosphate to H-10 of amorpha-4,11-diene singled out the bisabolyl carbocation mechanism with a 1,3-hydride shift. Further