Two novel routes to the naturally occurring CD45 protein tyrosine phosphatase inhibitor, (Z)-pulchellalactam, and its derivatives are reported in two steps starting from dienoic acids through electrophilic cyclisation. This methodology proceeds regio- and stereoselectively, and can be used to design a library of synthetic pulchellalactam analogues.
Key words
dienoic acids - dienamides - iodocyclization - electrophilic cyclization - pulchellalactam