Phosphine Gold(I)-Catalyzed Hydroamination of Alkenes under Thermal and Microwave-Assisted Conditions
作者:Xin-Yuan Liu、Cheng-Hui Li、Chi-Ming Che
DOI:10.1021/ol060719x
日期:2006.6.1
[reaction: see text] Phosphine gold(I) complexes catalyzed isomerization of terminal alkenes and hydroamination of unactivated alkenesunderthermal and microwave-assistedconditions. This is the first example of the use of microwave radiation as a heat source for gold(I)-catalyzed organic reactions.
In benzene, the competitive hydrogenabstraction by the chlorine atom occurred to an appreciable extent and the participation of the chlorine atom was retarded with N2-flow control. In an aqueous solution (AcOH-H2O, t-BuOH-H2O), the quantitative conversion to γ-and δ-chloroalkanesulfonamide was observed; this was thought to be due to the intramolecularhydrogenabstraction by the sulfonamide radical
Intramolecular Asymmetric Amidations of Sulfonamides and Sulfamates Catalyzed by Chiral Dirhodium(II) Complexes
作者:Corinne Fruit、Paul Müller
DOI:10.1002/hlca.200490148
日期:2004.7
Enantioselective intramolecularamidation of aliphatic sulfonamides was achieved for the first time by means of chiral carboxylatodirhodium(II) catalysts in conjunction with PhI(OAc)2 and MgO in high yields and with enantioselectivities of up to 66% (Scheme 3, Table 1). The best results were obtained with [Rh2(S)-nttl)4] and [Rh2(R)-ntv)4] as catalysts ((S)-nttl=(αS)-α-(tert-butyl)-1,3-dioxo-2H-
脂族磺酰胺类化合物的对映选择性分子内酰胺化反应是首次通过手性羧甲基二铑(II)催化剂与PhI(OAc)2和MgO的结合实现,高收率且对映选择性高达66%(方案3,表1)。用[Rh 2 ((S)-nttl)4 ]和[Rh 2 (R)-ntv)4 ]作为催化剂((S)-nttl =(αS)-α-(叔丁基)可获得最佳结果)-1,3-dioxo-2 H-苯并[ de ]异喹啉-2-乙酰基,(R)-nto =(αR)-α-异丙基-1,3-二氧杂-2- H-苯并[ de ]异喹啉-2-乙酰基)。此外,尽管这些羧酰二叉鎓(II)催化剂的分子内酰胺化反应也很有效,尽管这些后者反应的对映选择性明显较低(方案4,表3)。