146060-95-9Relevant articles and documents
Chemistry of Silylketenes: a Simple Preparation of α-Silyl-α-stannylacetic Esters and Their Stereoselective Reformatsky-type Reaction with Aldehydes or Aldimines
Akai, Shuji,Tsuzuki, Yasunori,Matsuda, Satoshi,Kitagaki, Shinji,Kita, Yasuyuki
, p. 2813 - 2820 (2007/10/02)
Silylketenes 1a, b reacted smoothly with alkoxystannanes 3 to give the corresponding α-silyl-α-stannylacetates 4 almost quantitatively.Treatment of 4 with TiCl4 caused selective cleavage of the C-Sn bond to bring about Reformatsky-type reaction with aldehydes 6 giving β-hydroxy-α-silyl esters 7.These two steps were carried out by one-pot operation, and variously substituted compounds 7 were obtained with high syn-selectivity (52-96percent d.e.) in 41-89percent yields.A similar one-pot procedure starting from 1a-c, 3, and aldimines 11 also provided the corresponding β-amino-α-silyl esters 12 with excellent syn-selectivity (96percent d.e. ) in 64-94percent yields.Stereocontrolled preparation of both (E)- and (Z)-α,β-unsaturated esters 8 and a syn-amino diol derivative 17 from syn-7 and syn-12, respectively, is also described.
