Efficient Approach to Fluvirucins B<sub>2</sub>−B<sub>5</sub>, Sch 38518, and Sch 39185. First Synthesis of their Aglycon, via CM and RCM Reactions
作者:Enric Llàcer、Fèlix Urpí、Jaume Vilarrasa
DOI:10.1021/ol901030f
日期:2009.8.6
fluvirucins B2−B5, Sch 38518, and Sch 39185) is reported for the first time. A ring-closing metathesis (RCM) generated the C6−C7 double bond, which by catalytic hydrogenation (in toluene) gave the desired epimer with a 9:1 diastereoselection. Azide 8a and carboxylic acid 5 came from ethyl-branched fragments C9−C13 (CHO at C9) and C1−C5 via an asymmetric allylation of the former and a cross metathesis