Efficient Desymmetrization of “Pseudo”-C2-Symmetric Substrates: Illustration in the Synthesis of a Disubstituted Butenolide from Arabitol
摘要:
A short synthesis of the homochiral disubstituted butenolide 1 is described in four steps from arabitol. The key steps are the selective kinetic protection of arabitol and the cyclization of 11 to form the butenolide ring. This last transformation represents a rare example of a fully stereoselective cyclitive desymmetrization process of a "pseudo"-C-2-symmetric substrate.
Total Synthesis of Proposed Amphidinolide A via a Highly Selective Ring-Closing Metathesis
摘要:
[GRAPHIC]A highly convergent synthesis of the proposed structure of amphidinolide A is reported. Instructive applications of several organometallic processes are illustrated, including a highly selective ring-closing metathesis reaction.
The present invention provides a compound having the structure (I) and processes for the production thereof and the intermediates used in such process.
PROTEASE INHIBITOR PRECURSOR SYNTHESIS
申请人:LINCLAU Bruno
公开号:US20120041215A1
公开(公告)日:2012-02-16
The present invention provides a compound having the structure (I) and processes for the production thereof and the intermediates used in such process.