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 .
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)
Total synthesis of (+)-pederin. 2. Stereocontrolled synthesis of (+)-benzoylselenopederic acid and total synthesis of (+)-pederin
作者:Tadashi Nakata、Shigeto Nagao、Takeshi Oishi
DOI:10.1016/s0040-4039(00)99028-2
日期:——
(+)-Benzoylselenopederic acid (1), a left half of (+)-pederin (3), was synthesized stereoselectively based on the Zn(BH4)2 reduction and totalsynthesis of (+)-pederin (3) was accomplished from 1 and the previously synthesized 2.