作者:Yoshinori Yamamoto、Jun-ichi Yamada、Tetsuya Asano
DOI:10.1016/0040-4020(92)80009-5
日期:1992.7
Tetraalkllleads (R4Pb) reacted quite smoothly with aldehydes R′CHO in the presence of TiCl4 to produce the corresponding alcohols (RCHOHR′) in high to good yields. The reagent system, R4Pb/TiCl4, exhibited high chemoselectivity; only aldehydes underwent the alkylation in the presence of ketones. Further, the new reagent exhibited high 1,2- and 1,3-asymmetric induction. The transfer order of alkyl groups
在存在TiCl 4的情况下,四烷基铅(R 4 Pb)与醛R'CHO的反应非常顺利,从而以高收率得到了相应的醇(RCHOHR')。试剂体系R 4 Pb / TiCl 4具有很高的化学选择性。只有醛在酮存在下进行烷基化。此外,新试剂表现出高的1,2-和1,3-不对称诱导。确定了醛与混合的四烷基铅/ TiCl 4反应中烷基的转移顺序;我>Et.i-Pr⪢n-Bu。