vinyl amines, vinyl carbamates and dienes, was achieved by using Ru(II)–Pheox catalysts. This catalytic system can function at a low catalyst loading (3 mol%) compared with those reported previously, and the desired cyclopropane products are obtained in high yields with excellent diastereoselectivity (up to >99 : 1) and enantioselectivity (up to 97% ee).
Asymmetric Synthesis of Trifluoromethylphenyl Cyclopropanes Catalyzed by Chiral Metalloporphyrins
作者:Gérard Simonneaux、Paul Le Maux、Sandrine Juillard
DOI:10.1055/s-2006-926451
日期:2006.5
The asymmetric addition of 2,2,2-trifluorodiazoethane to styrene derivatives to give optically active trifluoromethylphenyl cyclopropanes (ee values up to 69%) was carried out by using chiral iron and ruthenium porphyrins as homogeneous and heterogeneous catalysts.
Enantioselective Cobalt-Catalyzed Preparation of Trifluoromethyl-Substituted Cyclopropanes
作者:Bill Morandi、Brian Mariampillai、Erick M. Carreira
DOI:10.1002/anie.201004269
日期:2011.2.1
Easy access on water: A cobalt‐catalyzed asymmetric preparation of trifluoromethylcyclopropanes has been developed that yields high enantioselectivities with a broad range of styrene substrates (see scheme). The reaction presents a new access to enantioenriched CF3‐containing building blocks.
This disclosure concerns a protected cyclopropylboronic acid comprising a substituted cyclopropyl group and a boronic ester group having a protecting group. The protecting group is an N-methyliminodiacetic acid (MIDA) group or MIDA-based group.
This disclosure concerns a protected cyclopropylboronic acid comprising a substituted cyclopropyl group and a boronic ester group having a protecting group. The protecting group is an N-methyliminodiacetic acid (MIDA) group or MIDA-based group.