24048-44-0Relevant articles and documents
Bisabolyl-derived sesquiterpenes from tobacco 5-epi-aristolochene synthase-catalyzed cyclization of (2Z,6E)-farnesvl diohosohate
Faraldos, Juan A.,O'Maille, Paul E.,Dellas, Nikki,Noel, Joseph P.,Coates, Robert M.
experimental part, p. 4281 - 4289 (2010/05/15)
We report the structures and stereochemistry of seven bisabolyl-derived sesquiterpenes arising from an unprecedented 1,6-cyclization (cisoid pathway) efficiently catalyzed by tobacco 5-epi-aristolochene synthase (TEAS). The use of (2Z,6E)-farnesyl diphosphate as an alternate substrate for recombinant TEAS resulted in a robust enzymatic cyclization to an array of products derived exclusively (≥99.5%) from the cisoid pathway, whereas these same products account for ca. 2.5% of the total hydrocarbons obtained using (2E,6E)-farnesyl diphosphate. Chromatographic fractionations of extracts from preparative incubations with the 2Z,6E substrate afforded, in addition to the acyclic allylic alcohols (2Z,6E)-farnesol (6.7%) and nerolidol (3.6%), five cyclic sesquiterpene hydrocarbons and two cyclic sesquiterpene alcohols: (+)-2-epiprezizaene (44%), (-)-α-cedrene (21.5%), (R)-(-)-β-curcumene (15.5%), R-acoradiene (3.9%), 4-epi-α-acoradiene (1.3%), and equal amounts of α-bisabolol (1.8%) and epi-R-bisalolol (1.8%). The structures, stereochemistry, and enantiopurities were established by comprehensive spectroscopic analyses, optical rotations, chemical correlations with known sesquiterpenes, comparisons with literature data, and GC analyses. The major product, (+)-2-epi-prezizaene, is structurally related to the naturally occurring tricyclic alcohol, jinkohol (2-epi-prezizaan-7 β-ol). Cisoid cyclization pathways are proposed by which all five sesquiterpene hydrocarbons are derived from a common (7R)-β-bisabolyl+/pyrophosphate - ion pair intermediate. The implications of the cisoid catalytic activity of TEAS are discussed.
Stereocontrolled Synthesis of (+/-)-Acorenone B Based on New Ring Conversion
Nagumo, Shinji,Suemune, Hiroshi,Sakai, Kiyoshi
, p. 1778 - 1779 (2007/10/02)
On the basis of a new ring conversion reaction from the bicyclooctane ring to the spirodecane ring, (+/-)-acorenone B was synthesized in a stereocontrolled fashion.
Synthetic Studies on Acorane-Alaskane Sesquiterpenes. I. Total Synthesis of (+/-)-β-Acorenol
Iwata, Chuzo,Nakamura, Shizuo,Shinoo, Yasutaka,Fusaka, Takafumi,Okada, Hideko,at al.
, p. 1961 - 1968 (2007/10/02)
(+/-)-β-Acorenol (2) was synthesized by the methal-ammonia reduction of (1R*,3aR*,5aR*,9aR*)-2,3,3a,4-tetrahydro-1,4,4,7-tetramethyl-1H,5aH-cyclopentabenzofuran (11a), which was prepared from the spirodienone