Exploration of a proposed biomimetic synthetic route to plumarellide. Development of a facile transannular Diels–Alder reaction from a macrocyclic enedione leading to a new 5,6,7-tricyclic ring system
作者:Yi Li、Gerald Pattenden
DOI:10.1016/j.tetlet.2010.10.154
日期:2011.4
A concise synthesis of the macrocyclic vinylbutenolide 19 is described, based on a facile RCM reaction of the substrates 16/18. Treatment of 19 with TFA containing water led to the 5,6,7-tricyclic compound 27, in a single step, in >90% yield, rather than to the alternative ring system 23 found in plumarellide (1). A rationale for the formation of 27 is presented, involving initial acid-catalysed hydrolysis