Influence of Polymerization Degree of Poly‐L‐Leucine Catalyst and Substituent Effect on the Julia‐Colonna Asymmetric Epoxidation of Benzalacetophenones.

Abstract

Oligomerization of L-leucine N-carboxyanhydride under different reaction conditions and investigation of the resulting poly-L-leucines as the catalyst of the Julia-Colonna asymmetric epoxidation of benzalacetophenones supports the original speculation that a α-helical structure of the catalyst is important for high asymmetric induction. -(TAKAGI, R.; BEGUM, S.; SIRAKI, A.; YONESHIGE, A.; KOYAMA, K.-I.; OHKATA*, K.; Heterocycles 64 (2004) 129-141; Dep. Chem., Grad. Sch. Sci., Hiroshima Univ., Higashi-Hiroshima 739, Japan; Eng.) -Mais 25-100

Visible-Light-Driven Epoxyacylation and Hydroacylation of Olefins Using Methylene Blue/Persulfate System in Water

“…Prepared from styrene and 3-chlorobenzaldehyde following the general procedure A to give the product as a white solid (88% yield, 227.7 mg, mp = 85–87 °C). All data were consistent with those previously reported …”

“…All data were consistent with those previously reported. 17 (4-Chlorophenyl)(3-phenyloxiran-2-yl)methanone (3d). Prepared from styrene and 4-chlorobenzaldehyde following the general procedure A to give the product as a white solid (85% yield, 219.9 mg, mp = 123−125 °C).…”