A mild one-pot method for the synthesis of acyclic N-(1-methoxyalkyl)amides starting from carboxylic acids and methyl imidates had been developed and applied to the total synthesis of the insect poison pederine .
one-pot method for the synthesis of acyclic N-(1-methoxyalkyl)amides starting from carboxylic acid and methyl imidates has been developed and applied to the first total synthesis of (+)-pederine (1), a potent insect poison. Furthermore, the stereocontrolledtotal synthesis of 1 was also achieved by employing acid catalyzed double alkoxy-exchange reaction of N-(1 -methoxylakyl)amide group as key step.
Totalsynthesis of optically active pedamide , one of the tetrahydropyran moieties of the potent insect poison pederine , was achieved by employing a new, remote controlled asymmetric reduction of a ketone as key step.
The conjugate addition of phenylselenomethyl-lithium to the α,β-unsaturated lactone (4) was a key step in a short synthesis of (±)-benzoylselenopederic acid (2); union of (2) and (±)-benzoylpedamide (3) by a modification of known procedures gave (±)-pederin (1).
Studies related to the synthesis of pederin. part 2. synthesis of pederol dibenzoate and benzoylpedamide
作者:Timothy M. Willson、Philip Kocienski、Krzysztof Jarowicki、Kim Isaac、Peter M. Hitchcock、Andrew Faller、Simon F. Campbell
DOI:10.1016/s0040-4020(01)81981-5
日期:1990.1
(3) of the insect toxin pederin (1) are described. An intramolecular directed aldol condensation was used to construct the tetrahydropyran ring in (+)-pederol dibenzoate (2). Better stereocontrol in the synthesis of (±)-benzoylpedamide (3) was achieved in which the stereochemistry at C-11 was introduced by a conjugate addition of TMSCN to the dihydropyranone (31). The synthesis of (±)-pederin from (±)-(3)