We found that these products were unstable to purification on silica-gel column chromatography, as rapid cyclo-reversion to starting material occurred. While reasonably stable to Florisil, there was insufficient resolution of product from starting material and catalyst impurities (see Supporting Information for additional details). We were pleased, however, that the products were perfectly stable to quick purifications by preparative TLC and to crystallization attempts. For example, we were successful in enriching the enantiomeric excess of product 3 from 90% to >99% by recrystallization from absolute ethanol (Scheme 2). Single-crystal X-ray diffraction analysis allowed us to determine its absolute configuration (CCDC 2324742), and we have assigned the configurations of other products by analogy. The products were stable to long-term storage on a bench-top or in a freezer set to -20 °C and were amenable to further synthetic manipulations (vide infra). Importantly, we were successful in separating ~300 mg of racemic product 17 into its (R) and (S) enantiomers using preparative supercritical fluid chromatography (SFC) (see Supporting Information for separation details and product traces). This provided an important proof-of-concept that even in cases of poor enantioselectivity, meaningful quantities of either enantiomer could be obtained using widely available separations technology.