Total synthesis of (+)-Leukotriene B4 methyl ester and its 5-epimer from (R)-glycidol
摘要:
The Pd-Cu coupling reaction of a chiral hydroxy-(E,E)-iododiene with a racemic acetylenic alcohol followed by reduction of the dienyne leads to the desired (Z,E,E) geometry and allows synthesis of LTB4 and its 5-epimer after separation of diastereomers.
Synthesis of (Z)-homoallylic alcohols and homoprop-2-ynylic alcohols via palladium-catalysed hydrogenolysis of prop-2-ynylic cyclic carbonates
摘要:
The decarboxylation-hydrogenolysis of prop-2-ynylic cyclic carbonates which have an internal acetylenic bond with ammonium formate in the presence of a catalytic amount of [Pd(acac)(2)l and Bu(3)(n)P afforded (Z)-homoallylic alcohols or homoprop-2-ynylic alcohols depending on the reaction conditions, however, hydrogenolysis of terminal prop-2-ynylic cyclic carbonates gave homoallylic alcohols; using (Z)-homoallylic alcohol 2b ass chiral synthon, the male sex pheromone of the pyralid moth Aphomia gularis has been synthesized.