Stereoselective Synthesis of the Butyrolactone and the Oxazoline/Furan Fragment of Leupyrrin A<sub>1</sub>
作者:Thomas Debnar、Tongtong Wang、Dirk Menche
DOI:10.1021/ol401110x
日期:2013.6.7
Stereoselective syntheses of the Northern and the Southern fragments 2 and 3 of leupyrrin A(1) are reported. The convergent preparation of 2 is highlighted by a zirconocene-mediated one-pot cyclization-regioselective opening of an advanced diyne while the route to 3 involves a Krische allylation and a one-pot Sharpless dihydroxylation-cyclization. Comparison of the spectroscopic data with those reported for the natural product supports a relative stereochemical assignment within these heterocycles.