Diastereoselective Allylstannane Additions to (<i>S</i>)-5,6-Dihydro-2<i>H</i>-5-phenyloxazin-2-one. A Concise Synthesis of (<i>S</i>)-β-Methylisoleucine
作者:Julie A. Pigza、Tadeusz F. Molinski
DOI:10.1021/ol1001126
日期:2010.3.19
The addition of allyl stannanes to (S)-4,5-dihydro-5-phenyl-2H-oxazinone (3) was achieved under Bronsted acid catalysis to give 2-allylmorpholinones with high diastereoselectivity (up to dr 14.2:1). The product of dimethylallyltributylstannane addition to 3 was converted to L-beta-methylisoleucine, an alpha-amino acid residue found in the complex, biologically active marine-derived peptides polytheonamides A and B, and polydiscamides A-C.