Coronafacic acid (1) is an acid component of coronatine, and has been isolated from several pathovars of Pseudomonas syringae. Syntheses of C6-non- and C6-alkyl-substituted analogues of 1 were accomplished via intramolecular 1,6-conjugate addition as the key step. Among them, 1 and four C6-alkyl-substituted analogues exhibited potato tuber-inducing activity, but the C6-non-substituted analogue did not
Intramolecular 1,6-conjugate addition approach for construction of the hydrindane framework: Total synthesis of (±)-coronafacic acid
作者:Shinji Nara、Hiroaki Toshima、Akitami Ichihara
DOI:10.1016/s0040-4039(96)01457-8
日期:1996.9
A new approach for the construction of the hydrindane framework has been achieved by intramolecular 1, 6-conjugate addition under some basic conditions. The precursors, α, β, γ, δ-unsaturated esters (11a-11d) were synthesized from the ester 8 and acrolein derivatives (6a-6d) via aldol condensation. This methodology was applied to the total synthesis of (±)-coronafacic acid and its analogues.
Synthesis of 3- and 4-substituted cyclic α-amino acids structurally related to ACPD
作者:Francisco Alonso、Irene Micó、Carmen Nájera、José M. Sansano、Miguel Yus、Jesús Ezquerra、Belén Yruretagoyena、Ismael Gracia
DOI:10.1016/0040-4020(95)00586-w
日期:1995.9
The preparation of 3-substituted cyclopentanones 12-16, 4-substituted cyclohexanones 23–28 and cycloheptanones 38–41 is described. Substituents in the cycloalkanones are carboxylate, phosphonate or tetrazole groups, separated from the ring by a 0, 1, 2, or 3 carbon atoms chain. These cycloalkanones have been transformed into α-amino acids 9–11 by hydrolysis of the corresponding hydantoin derivatives
Asymmetric total syntheses of (+)-coronafacic acid and (+)-coronatine, phytotoxins isolated from Pseudomonas syringae pathovars
作者:Shinji Nara、Hiroaki Toshima、Akitami Ichihara
DOI:10.1016/s0040-4020(97)00614-5
日期:1997.7
Asymmetric totalsynthesis of (+)-coronafacic acid (2), was accomplished via intramolecular 1, 6-conjugate addition as the key step. The chiral ester (+)-7 was prepared via two approaches: starting from (R)-(+)-4-acetoxy-2-cyclopenten-1-one (12), and using catalytic asymmetric Michael reactions promoted by heterobimetallic BINOL complexes. Coupling between (+)-2 and the protected coronamic acid 8 and subsequent