705931-13-1Relevant articles and documents
A facile phenol-driven intramolecular diastereoselective thermal/base-catalyzed dipolar [2 + 2] annulation reactions: An easy access to complex bioactive natural and unnatural benzopyran congeners
Mondal, Mukulesh,Puranik, Vedavati G.,Argade, Narshinha P.
, p. 2068 - 2076 (2007)
The complex bioactive natural and unnatural benzopyran congeners have been synthesized using one-/two-step approaches in very good yields from the reactions of two different dihydroxyphthalides, natural resorcyclic acid derivative, and trihydroxybenzophenone with citral and/or farnesal, via the phenol-driven intramolecular diastereoselective thermal/base-catalyzed dipolar [2 + 2] cycloaddition reactions and three different thermal intramolecular cyclization reactions. The effects of the nature and the position of phenolic groups in the starting materials on the course of these cycloaddition reactions have also been described. Depending upon the absence or presence of intramolecular hydrogen bonding of the phenolic group with the carbonyl moiety in the starting materials, these phenol-driven intramolecular thermal/base-catalyzed dipolar [2 + 2] cycloaddition reactions either furnished the kinetically controlled products or directly formed the thermodynamically controlled rearranged products, respectively.
A modular and concise total synthesis of (±)-daurichromenic acid and analogues
Hu, Hongjuan,Harrison, Tyler J.,Wilson, Peter D.
, p. 3782 - 3786 (2007/10/03)
A modular and concise total synthesis of (±)-daurichromenic acid has been accomplished in four steps from ethyl acetoacetate, ethyl crotonate, and trans,trans-farnesal. A series of analogues of this natural product, which has potent anti-HIV activity, were also prepared from ethyl or methyl acetoacetate and a series of readily available α,β-unsaturated esters and aldehydes.
