18028-10-9Relevant academic research and scientific papers
Total synthesis of natural and unnatural lamellarins with saturated and unsaturated D-rings
Ploypradith, Poonsakdi,Petchmanee, Thaninee,Sahakitpichan, Poolsak,Litvinas, Nichole D.,Ruchirawat, Somsak
, p. 9440 - 9448 (2007/10/03)
(Chemical Equation Presented) Twenty-eight natural and unnatural lamellarins with either a saturated or an unsaturated D-ring were synthesized according to our developed synthetic route. The key step involved the Michael addition/ring closure (Mi-RC) of the benzyldihydroisoquinoline and α-nitrocinnamate derivatives, which provided the 2-carboethoxypyrrole intermediates in moderate to good yields (up to 78% yield). Subsequent hydrogenolysis/lactonization furnished lamellarins with a saturated D-ring in excellent yields (up to 93% yield). DDQ oxidation of the saturated lamellarin acetates led directly to the corresponding unsaturated analogues in 54-95% yield. In addition, only two steps in our developed strategy require column chromatography.
Oxidative Coupling of Phenols and Phenolic Ethers. Part 4. Synthesis of Dibenzazonines and a Dibenzazecine, via Direct Coupling
McDonald, Edward,Wylie, Robert D.
, p. 1104 - 1108 (2007/10/02)
Two series of amides, N-phenethylphenylacetamides (9) and the bisphenetylamides (11), including diphenolic monophenolic, and non-phenolic types, were treated with a range of one-electron oxidants.With the tetramethoxy-derivative (11e) intramolecular coupling yielded a dibenzazonine (16) in 36percent yield.Similar oxidation of the homologue (18) gave a dibenzazecine (19) in 60percent yield.
