N-(4-methylbenzenesulfonyl)- pyrrolidines and piperidines by a tandem SN2-michael addition reaction
摘要:
A tandem S(N)2-Michael addition sequence has been developed for the preparation of N-(4-methylbenzenesulfonyl)- pyrrolidines and piperidines bearing functionalized side chains at C-2.
N-(4-methylbenzenesulfonyl)- pyrrolidines and piperidines by a tandem SN2-michael addition reaction
摘要:
A tandem S(N)2-Michael addition sequence has been developed for the preparation of N-(4-methylbenzenesulfonyl)- pyrrolidines and piperidines bearing functionalized side chains at C-2.
Trialkylborane as an Initiator and Terminator of Free Radical Reactions. Facile Routes to Boron Enolates via α-Carbonyl Radicals and Aldol Reaction of Boron Enolates
作者:Kyoko Nozaki、Koichiro Oshima、Kiitiro Utimoto
DOI:10.1246/bcsj.64.403
日期:1991.2
variety of trialkylborane-induced reactions were examined for the preparation of the α-carbonyl radicals: (1) addition of alkyl radical to methyl vinyl ketone, (2) reduction of α-halo ketone, and (3) intramolecular radical addition to α,β-unsaturated carbonyl moiety. Trialkylborane reacted with α-carbonyl radicals to give boron enolates. The resulting boron enolates were efficiently trapped by carbonyl
Facile routes to boron enolates. Et3B-mediated Reformatsky type reaction and three components coupling reaction of alkyl iodides, methyl vinyl ketone, and carbonyl compounds
作者:Kyoko Nozaki、Koichiro Oshima、Kiitiro Utimoto
DOI:10.1016/0040-4039(88)85330-9
日期:——
Reaction of α-bromoketones with Ph3SnH in the presence of Et3B provides boron enolates which react with carbonyl compounds to give β-hydroxyketones in good yields. Et3B-induced Reformatsky type reaction of α-iodoketones with an aldehyde or ketone proceeds without Ph3SnH.