A 1,3,2‐Diazaphospholene‐Catalyzed Reductive Claisen Rearrangement
作者:John H. Reed、Pavel A. Donets、Solène Miaskiewicz、Nicolai Cramer
DOI:10.1002/anie.201904411
日期:2019.6.24
catalysts for very mild reductive Claisenrearrangements. The method is tolerant towards a wide variety of functional groups and operates at ambient temperature. Besides being enantiospecific for substrates with existing stereogenic centers, the diastereoselectivity can be switched by varying solvents and DAP catalysts. The reaction kinetics show direct rearrangements of O‐bound phospholene enolates
Unusual iodine catalyzed lactonization of γ-methyl-γ,δ-pentenoic acids: A facile synthesis of γ,γ-dimethyl-γ-butyrolactones
作者:Kyoung Mahn Kim、Eung K. Ryu
DOI:10.1016/0040-4039(96)00026-3
日期:1996.2
γ,γ-Dimethyl-γ-butyrolactones were exclusively obtained from γ-methyl-γ,δ-pentenoicacids with a catalytic amount of iodine in good yields in methylene chloride.