Preparation of <i>syn</i>-Tertiary Homoallylic Alcohols Utilizing Allenyltitanocenes Generated by Reductive Titanation of γ-Trimethylsilylpropargylic Carbonates
syn-Tertiary homoallylic alcohols were obtained by the reaction of α-silylallenyltitanocenes generated by the reductive titanation of γ-silylpropargylic carbonates with Cp2Ti[P(OEt)3]2 with ketones and following desilylation and partial hydrogenation. High diastereoselectivity was observed when aromatic and α,β-unsaturated ketones were employed.
通过将Cp 2 Ti [P(OEt)3 ] 2与酮还原,然后将甲硅烷基化和部分氢化,将γ-甲硅烷基丙炔碳酸酯进行钛化反应而生成的α-甲硅烷基烯丙基噻吩茂烯,可得到顺式叔丁基醇。当使用芳族和α,β-不饱和酮时,观察到高非对映选择性。