77256-32-7

Upstream product

• 82863-33-0 (4α)-10α-<2-(benzyloxy)ethyl>-1α-methyl-2α,8β,12-triacetoxy-5-oxo-11-oxatricyclo<7.2.1.0>dodecane 
• 72844-64-5 (4aS,5R,8aR)-5-(2-Benzyloxy-ethyl)-6-methyl-1,4-dioxo-1,3,4,5,8,8a-hexahydro-2H-naphthalene-4a-carboxylic acid methyl ester 
• 82863-32-9 (4α)-10α-<2-(benzyloxy)ethyl>-1α-methyl-5-oxo-11-oxatricyclo<7.2.1.0>dodecane-2α,8β,12-triol 
• 82808-10-4 (4β)-10α-<2-(benzyloxy)ethyl>-1α-methyl-2,5α-epoxy-5β-<(tert-butyldimethylsilyl)oxy>-8,12-dioxo-11-oxatricyclo<7.2.1.0>dodecane 
• 82808-11-5 (4β)-10α-<2-(benzyloxy)ethyl>-1α-methyl-2,5α-epoxy-5β-<(tert-butyldimethylsilyl)oxy>-11-oxatricyclo<7.2.1.0>dodecane-8α,12-diol 
• 82808-08-0 4aβ-(carbomethoxy)-6-methyl-6,7-epoxy-5α-<2-(benzyloxy)ethyl>-2,3,4a,5,8,8aα-hexahydronaphthalene-1,4-dione 
• 82808-09-1 (4α)-10α-<2-(benzyloxy)ethyl>-1α-methyl-5,8,12-trioxo-11-oxatricyclo<7.2.1.0>dodecan-2α-ol 

Relevant academic research and scientific papers

An Approach to the BCDE Ring of Quasimarin

A 10-step route to the BCDE ring system of quasimarin (1) is described.Key features of the route include the regioselective protection of diketone 7 by use of intramolecular ketal formation, a two-step lactone to ether reduction, and a regioselective lactonization.The tetracyclic system 15 is produced in 29percent overall yield.