Compounds, tautomers and pharmaceutically acceptable salts of the compounds are disclosed, wherein the compounds have the structure of Formula Ia,
as defined in the specification. Corresponding pharmaceutical compositions, methods of treatment, methods of synthesis, and intermediates are also disclosed.
Diastereoselective [3+2] cycloaddition of allyltrialkylsilanes to intermediate N-acyliminoesters obtained from methyl-4-methoxy-2-imidazolidinone- and 2-oxazolidinone-4-carboxylates
作者:Annette Stahl、Eberhard Steckhan、Martin Nieger
DOI:10.1016/0040-4039(94)85317-7
日期:1994.10
using allylsilanes as nucleophiles in the presence of TiCl4 affords three carbon ring annulation products 5 and 9 via a [3+2] cycloaddition. Besides that, the simple methoxy group substitution product is formed. The ring annulation occurs with practically total diastereoselectivity so that all substituents are located on the β-side of the bicyclic product.