描述了合成 phomactin 天然产物的对映选择性策略。使用路易斯酸引发嵌入 12 元大环的 β-碘联烯醇环化,以良好的收率和高非对映选择性获得高度官能化的双环[9.3.1]十五烷。这种碘烯酮含有天然产物 phomactin 家族 AD 环系统的取代基,适合进一步功能化。从 AD 碘烯酮中间体合成了 phomactin A 的 oxadecalin 核心。在这种不寻常的策略中,环 A 和环 B 均在大环前体内形成。
描述了合成 phomactin 天然产物的对映选择性策略。使用路易斯酸引发嵌入 12 元大环的 β-碘联烯醇环化,以良好的收率和高非对映选择性获得高度官能化的双环[9.3.1]十五烷。这种碘烯酮含有天然产物 phomactin 家族 AD 环系统的取代基,适合进一步功能化。从 AD 碘烯酮中间体合成了 phomactin A 的 oxadecalin 核心。在这种不寻常的策略中,环 A 和环 B 均在大环前体内形成。
An aromatic compound represented by the general formula Ar
1
X is reacted with a palladium compound and a phosphine derivative, in the presence of a first basic substance, thereby producing a palladium-complex compound represented by the general formula Ar
1
—PdL
2
X. This palladium-complex compound is reacted with a benzoic acid represented by the general formula Ar
2
—COOH, in the presence of a second basic substance, thereby producing another palladium-complex compound represented by the following general formula.
1
The above palladium-complex compounds are useful as catalysts and can be produced easily by the above reactions. In the above general formulas, Ar
1
is an aryl group; and X is a halogen that is fluorine, chlorine, bromine or iodine, trifluoromethanesulfonate group, an alkylsulfonate group having a carbon atom number of 1-4, or a substituted or unsubstituted arylsulfonate group; each L is independently a phosphine ligand; and Ar
2
is an aryl group.
A tropos rhodium(I) complex having skewphos ligand is shown to be a highlyenantioselective catalyst for asymmetric ene-type carbocyclization of 1,6-enynes with tri-substituted olefins to control quaternary stereogenic centers or spiro-rings.
A New N,P-Ligand with Achiral gem-Dimethyloxazoline for Palladium(II)-Catalyzed Cyclization of 1,6-Enynes: Transition State Probe for the N/C trans Mode in Mizoroki−Heck-Type C−C Bond Formation
A cationic rhodium(I) complex having a skewphos ligand is shown to be a highlyenantioselective catalyst for asymmetric carbocyclization of 1,6-enynes with tri-substituted olefins to control quaternary stereogenic centers of spiro-rings.