NMR Determinations of the Absolute Configuration of α-Chiral Primary Amines
作者:Hiroki Fukui、Yukiharu Fukushi
DOI:10.1021/ol100951s
日期:2010.6.18
We have established a methodology to determine the absoluteconfiguration of α-chiral primary amines by derivatization to the corresponding imines with each enantiomer of 2′-methoxy-1,1′-binaphthalene-8-carbaldehyde (1). This methodology proceeds on the basis of modified Mosher’s method, and sufficiently large ΔδRS values can be obtained to elucidate the stereochemistry of the amines.
Efficient syntheses of 14H-dinaphtho[1,8-bc:1',8'-fg]oxocin-14-one (2), 14H-dinaphtho[1,8-bc:1',2'-f]oxepin-14-one (3), and 2,2'(2H,2'H)-spirobi[naphtho[1,8-bc]furan] (9) are described. The putative structure of 2 has been reported previously, but the synthetic route was not reproducible. 7H-Dibenzo[c,h]xanthen-7-one (4), a known compound, was obtained by a different method. Possible reaction mechanism