Iron-Catalyzed Aminolysis of β-Carbonyl 1,3-Dithianes: Synthesis of Stereodefined β-Enaminones and 3,4-Disubstituted Pyrazoles
摘要:
A novel iron-catalyzed aminolysis of beta-carbonyl 1,3-dithianes with various amines including ammonia, primary and secondary amines, as well as hydrazine hydrate has been developed, leading to the synthesis of steleodefined beta-enaminones and 3,4-disubstituted pyrazoles in good to high yields.
Copper-Mediated C−N Bond Formation via Direct Aminolysis of Dithioacetals
作者:Jing Kang、Fushun Liang、Shao-Guang Sun、Qun Liu、Xi-He Bi
DOI:10.1021/ol060763c
日期:2006.6.1
to the C-N bond formation via direct aminolysis of dithioacetals 2 and 5 with ammonia, primary or secondary amines are developed under mild conditions. Enaminones 3 and 6 were thus obtained in high to excellent yields with high chemoselectivity. This type of aminolysis reaction presents a newsyntheticapplication of the dithioacetalfunctionality. [reaction: see text]
Routes to building blocks for heterocyclic synthesis by reduction of ketene dithioacetals
作者:John M Mellor、Stephen R Schofield、Stewart R Korn
DOI:10.1016/s0040-4020(97)10136-3
日期:1997.12
Two general methods have been developed permitting the effective reduction of ketene dithioacetals to give substituted dithianes. Reduction with magnesium in methanol is less reliable than reduction with zinc in acetic acid. The greater inconsistency of magnesium in methanol has been investigated by a cyclic voltammetric study of the substrates. The utility of the dithianes has been successfully illustrated
A novel iron-catalyzed aminolysis of beta-carbonyl 1,3-dithianes with various amines including ammonia, primary and secondary amines, as well as hydrazine hydrate has been developed, leading to the synthesis of steleodefined beta-enaminones and 3,4-disubstituted pyrazoles in good to high yields.