A highlystereoselective joint total synthesis of the potent polyketide macrolide antibiotics etnangien and etnangien methyl ester was accomplished by a convergent strategy and proceeds in 23 steps (longest linear sequence). Notable synthetic features include a sequence of highlystereoselective substrate-controlled aldolreactions to set the characteristic assembly of methyl- and hydroxyl-bearing
Organosilicon compounds have been extensively utilized both in industry and academia. Studies on the syntheses of diverse organosilanes is highly appealing. Through‐space metal/hydrogen shifts allow functionalization of C−H bonds at a remote site, which are otherwise difficult to achieve. However, until now, an aryl to alkyl 1,5‐palladium migration process seems to have not been presented. Reported
[EN] SILICON COMPOUNDS<br/>[FR] COMPOSES DE SILICIUM
申请人:AMEDIS PHARM LTD
公开号:WO2004050665A1
公开(公告)日:2004-06-17
A compound of formula (I) wherein one of R1 and R2 is -Si(R)3, and the other is hydrogen or -Si(R)3; or R1 is a bond, R2 is -Si(R)2- or -Si(R)2 -O-Si(R)2-, and R10-CH2-CH-CH-OR2 taken together form a ring; R3 and R4 are the same or different and are each halogen; and each R is the same or different and is alkyl, aryl, cycloalkyl or heterocycloalkyl; or a pharmaceutically acceptable salt thereof.