Highly Enantioselective Hydrogenation of β‐Alkyl and β‐(ω‐Chloroalkyl) Substituted β‐Keto Esters
摘要:
Highly enantioselective hydrogenation of beta-alkyl and beta-(omega-chloroalkyl) substituted beta-keto esters was achieved with Ru catalysts based on chiral diphosphinesin EtOH at 50 degrees C under 50-bar initial hydrogen pressure, affording the corresponding beta-hydroxy esters in > 98% ee.
Synthesis of 3-Acylpyrroles, 3-(Alkoxycarbonyl)pyrroles, 1,5,6,7-Tetrahydro-4H-indol-4-ones and 3-Benzoylpyridines Based on Staudinger-Aza-Wittig Reactions of 1,3-Dicarbonyl Compounds with 2- and 3-Azido-1,1-dialkoxyalkanes
The Staudinger-aza-Wittig reaction of 1,3-dicarbonyl compounds with 2-azido-1,1-diethoxyethane and subsequent cyclization allowed an efficient synthesis of a variety of pyrroles, 1,5,6,7-tetrahydro-4H-indol-4-ones, and of a pyridine. cyclization - N-heterocycles - pyrroles - azides