A Mild and Efficient Three-Component Synthesis of Secondary and Tertiary Homoallylic Hydrazides
作者:Bum Seok Lee、Doo Ok Jang
DOI:10.1002/ejoc.201201757
日期:2013.5
Zn(ClO4)2·6H2O was developed for the syntheses of secondary and tertiary homoallylic hydrazides. Excellent chemoselectivities and diastereoselectivies were observed. Aldehydes as well as acyclic and cyclic ketones were well-suited to the reaction conditions and provided secondary and tertiary homoallylic hydrazides in excellent yields.
Synthesis of homoallylic amines and acylhydrazides by tin powder-promoted multicomponent one-pot allylation reactions
作者:Junyan Ma、Danfeng Huang、Ke-Hu Wang、Yanli Xu、Siying Chong、Yingpeng Su、Ying Fu、Yulai Hu
DOI:10.1002/aoc.3472
日期:2016.7
efficient process for the synthesis of homoallylic amines and N′‐homoallylic hydrazides is developed from the one‐pot reaction of carbonyl compounds, amines or N‐acylhydrazines, allyllic bromide and tin powder using water as solvent. N‐Acylhydrazines are found to be more reactive than amines in these processes. They can react not only with aldehydes but also with ketones to give the corresponding N′‐homoallylic
Facile preparation of allylzinc species from allylboronates and zinc amide via a boron-to-zinc exchange process and their reactions with carbonyl compounds, imines and hydrazones
作者:Yi Cui、Yasuhiro Yamashita、Shū Kobayashi
DOI:10.1039/c2cc34340a
日期:——
Facile formation of allylzinc species from allylboronate and zinc amide was discovered. The boron-to-zinc exchange process occurred smoothly to afford the corresponding allylzinc amides, which were successfully employed in catalytic allylation reactions with electrophiles. Asymmetric catalysis using a chiral zinc amide is also reported.
Catalytic Use of Zinc Amide for Transmetalation with Allylboronates: General and Efficient Catalytic Allylation of Carbonyl Compounds, Imines, and Hydrazones
The efficient catalytic allylation of ketones, imines, and hydrazones with allylboronates using a catalytic amount of zinc amide is reported. In this reaction, the boron‐to‐zinc exchange process occurred smoothly to afford the corresponding allylzinc amides, and the desired allylation reactions proceeded in high efficiency (∼0.1 mol%). A mechanistic study revealed that transmetalation was a rate‐determining
Allyltrichlorosilanes reacted with benzoylhydrazones in DMF without the use of any catalyst to afford the corresponding homoallylic benzoylhydrazines in good to high yields. The reactions proceeded at 0 degrees C to room temperature under mild conditions. In addition, it was found that the reactions tolerated well the steric hindrance of hydrazones and allyltrichlorosilanes. Indeed, ketone-derived