1-碳甲氧基-1-链烯氧基苯并环丁烯4a-d的热解通过Eo-喹二甲烷的化学选择性电环反应以高收率产生了二氢萘7a-d。然后,通过顺序地脱氢和脱保护,将7a,b,d容易地转化为2-萘酚9(R 1= R 2= H)。在这里开发的转换方法已成功地应用于新carcarinostatin生色团10的甲醇分解产物12的有效合成。
The present invention relates to a tricyclic heterocyclic derivative of Formula (I) wherein the variables are as defined in the specification. The present invention further relates to pharmaceutical compositions comprising these compounds and to their use in therapy, in particular for the treatment of serotonin-mediated disorders such as obesity, schizophrenia and cognitive dysfunction.
Stereoselective synthesis of the basic skeleton of aphidicolan-type diterpenes via intramolecular Diels–Alder cyclisation. Synthetic approach to aphidicoline
The basic tetracyclic skeleton of aphidicolan-type diterpenes has been synthesised by an intramolecularDiels–Alder reaction of 1-(1-cyano-5-methoxy-3-methylbenzocyclobuten-1-yl)hept-6-en-3-one (9). The cyclised product (10) was converted into the tetracyclic compound (11) by treatment with base followed by acid hydrolysis. The stereochemistry of (11) was easily determined from the n.m.r. spectral
Thermolysis of 4-acetoxymethylene-2-[2-benzyloxy-2-(5-methoxy-3-methylbenzo-cyclobuten-1-yl] ethyl-2-methylcyclopentan-1, 3-dione 1-ethylene ketal (21) gave the stachane-type tetracyclic compound (24), whose deketalization afforded 26, a potential synthetic intermediate to the quassinoid klaineanone (1).