Highly stereoselective addition to alkoxy or hydroxy ketones using an α-stannyl ester–stannous chloride system in a chelation-controlled manner
作者:Makoto Yasuda、Keishi Okamoto、Toshifumi Sako、Akio Baba
DOI:10.1039/b008493j
日期:——
The reaction of an α-stannyl ester with α-alkoxy or hydroxy ketones in the presence of SnCl2 gave aldol-type products with high selectivity in a chelation-controlled manner.
In- or In(I)-Employed Tailoring of the Stereogenic Centers in the Reformatsky-Type Reactions of Simple Ketones, α-Alkoxy Ketones, and β-Keto Esters
作者:Srinivasarao Arulananda Babu、Makoto Yasuda、Ikuya Shibata、Akio Baba
DOI:10.1021/jo051659w
日期:2005.12.1
derived from the branched α-halo ester. Next, with the view of tailoring high degree of stereoselection, the concept of chelation-controlled addition of indium enolates was envisioned. In this line, marvelously syn selective additions to α-alkoxy ketones and β-ketoesters were established. Interestingly, these diastereoselective additions to α-alkoxy ketones and β-ketoesters require either In(I)X or In−InCl3