tosylation of the previously reported diol 14 followed by oxy-Michael addition and iodination furnished the requisite iodoalkene 13 in 62% yield over three steps,21 setting the stage for the proposed annulation.
tosylation ofthe previously reported diol 14 followed by oxy-Michaeladdition and iodination furnished the requisite iodoalkene 13 in62% yield over three steps,21 setting the stage for the proposedannulation.