Total Synthesis of a Trehalose-Containing Lipooligosaccharide Analogue from

A short and efficient methodology has been developed to synthesize an analogue of a lipooligosaccharide from isolated from Crohn's disease. The total synthesis of the tetrasaccharide was achieved via a convergent [2 + 2] glycosylation approach. The key features of the synthesis involve the selective functionalization of a trehalose core via highly regioselective acylations and regioselective glycosylations. The synthesis was completed via a longest linear sequence of 14 steps in a 14.2% overall yield.