455885-67-3Relevant academic research and scientific papers
α-phosphono lactone analogues of farnesyl pyrophosphate: An asymmetric synthesis via ring-closing metathesis
Du, Yanming,Wiemer, David F.
, p. 5701 - 5708 (2007/10/03)
An α-phosphono lactone derivative of farnesol has been prepared, in both racemic and nonracemic forms, to provide a new type of farnesyl pyrophosphate analogue. Attempted preparation of the racemic α-phosphono lactone through rearrangement of a vinyl phosphate derived from the parent lactone resulted in both rearrangement and lactone ring opening, revealing that the farnesyl lactone was not stable to the excess of strong base required for the rearrangement. A procedure for C-P bond formation based on generation of the lactone enolate, reaction with a P(III) reagent, and oxidation was successful in providing the racemic α-phosphono lactone, in part, because only 1 equiv of strong base was required. The same strategy for phosphonate synthesis then was applied to the nonracemic farnesyl lactone, prepared through a sequence including allylation of farnesal with a nonracemic borane reagent, reaction of the product alcohol with acryloyl chloride, and formation of an unsaturated lactone through ring-closing metathesis. A similar strategy gave the corresponding racemic α-phosphono lactam through a six-step sequence from farnesal.
Regioselective ring-closing metathesis on terpenoid acrylates and acrylamides
Du, Yanming,Wiemer, David F
, p. 6069 - 6072 (2007/10/03)
A series of acrylate esters was prepared by treatment of representative terpenoid aldehydes with allyl or vinyl magnesium bromide followed by reaction with acryloyl chloride. In all cases, ring-closing metathesis (RCM) resulted in regioselective formation
