Monoclinic modification ofN-[(1,1-dimethylethoxy)carbonyl]-3-[(R)-prop-2-en-1-ylsulfinyl]-(R)-alanine ethyl ester at 200 (1) K

Abstract

In the monoclinic polymorph of the title compound, C13H23NO5S, inter­molecular N—H⋯O hydrogen bonds link mol­ecules into one-dimensional chains along [100]. The atoms of the terminal propenyl group are disordered over two sets of sites with refined occupancies of 0.69 (2) and 0.31 (2).

Triclinic modification ofN-[(1,1-dimethylethoxy)carbonyl]-3-[(R)-prop-2-en-1-ylsulfinyl]-(R)-alanine ethyl ester at 120 (1) K

“…This difference is reflected in the the values of the S1-C6-C7-C8 torsion angles for molecules A and B which are -89.5 (13) and112.2 (13)°, respectively. Data for the title compound were also collected at 200 (1) K and the crystal structure solves and refines in the monoclinic space group P2 1 (Singh et al, 2009) with one molecule in the asymmetric unit and a disordered propenyl group. The torsion angles for the S1-C6-C7-C8 sequence of atoms in the major and minor components of the disorder are -99 (1) and 107 (3).…”

Diastereoselective Alkylations of a Protected Cysteinesulfenate

“…As indicated, all the benzyl sulfoxides could be separated on a CHIRACEL-OJ chiral HPLC column and the major isomer always eluted second under consistent elution conditions. Allyl and methyl sulfoxides 6 / 7j / k could not be assessed by HPLC, but crystals of 6k were grown and successfully analyzed by X-ray crystallography, wherein the sulfinyl configuration was established to be R …”