Synthesis of a model hapten with cyclohexanediol and .alpha.-methylene-.gamma.-butyrolactone groups, a synthetic analog of poison ivy and tulipalin allergens connected with a carbon chain
The title compound was prepared in seven steps starting from the commercially available 4-ketopimelic acid. The key step features an enantioselective lactonization promoted by PPL. (C) 2000 Published by Elsevier Science Ltd.