A procedure for synthesizing potentially anancomeric equatorial phenyl phosphites (cis-l and eq-cis-2) is reported. Spectral characteristics and low-temperature NMR studies on the phenyl phosphites suggest that eq-cis-a is a system with a predominant chair conformation in solution. On the contrary, cis-l is conformationally heterogeneous.
The structure of the title compound, (4S,6S,11R)-(+)trans-4,6-dimethyl-2-(1-phenylethylamino)-1,3,2-lambda(5)-dioxaphosphorinane-2-thione, C13H20NO2PS, which crystallizes in the trigonal crystal system in the uncommon space group P3(1)21 (No. 152), has been determined from three-dimensional x-ray diffraction data.
MORITA, IWAO;KUNIMOTO, KATSUTOSHI;TSUDA, MASAMI;TADA, SHIN-ICHI;KISE, MAS+, CHEM. AND PHARM. BULL., 35,(1987) N 10, 4144-4154