Reactions of coordinated geminal dichromium reagents with aldehydes: stereoselective formation of (Z)-2-chloroalk-2-en-1-ols
作者:Kazuhiko Takai、Ryo Kokumai、Takahumi Nobunaka
DOI:10.1039/b102387j
日期:——
Treatment of a carbonate ester of 2,2,2-trichloroethanol
derivative with CrCl2–DMF in THF gives a
β-carbonate-coordinated geminal dichromium species, which adds to an
aldehyde and eliminates an acyloxychromium group to afford a
(Z)-2-chloroalk-2-en-1-ol stereoselectively.
用四氢呋喃中的 CrCl2-DMF 处理 2,2,2-三氯乙醇衍生物的碳酸酯,可得到β-碳酸酯配位的宝石色二氢铬,它与醛相加并消除酰氧基铬基,从而立体选择性地得到 (Z)-2-chloroalk-2-en-1-ol 。