Stereocontrolled construction of angularly functionalized trans-fused cycloheptanoids via α-hydroxycyclobutane rearrangement followed by retroaldol cleavage
摘要:
Acid-catalysed rearrangement of alpha-hyroxycyclobutane derivatives 3a-3c followed by retroaldol cleavage and oxidation in an one-pot operation furnished angularly carboxylated trans-fused cycloheptanoid compounds 5a-5c.
Novel rearrangement of 5,6-disubstituted bicyclo[4.2.0]octan-2-ones with aluminum chloride. Application to total synthesis of (.+-.)-5-oxosilphiperfol-6-ene and (.+-.)-silphiperfol-6-ene