通过使用[Mn(2,6-Cl 2 TPP)Cl](1)作为催化剂,Oxone / H 2 O 2作为氧化剂,我们开发了一种有效的方法,用于无环烯丙基取代的烯烃的赤型选择性环氧化,包括烯丙醇,胺和酯。末端烯丙基烯烃可达到9:1的赤型选择性,这明显高于使用m -CPBA作为氧化剂所达到的选择性。此外,这种环氧化方法的合成效用在关键的抗HIV药物中间体的立体选择性合成和糖基的环氧化中得到了强调。
Organoiodine-Catalyzed Enantioselective Intermolecular Oxyamination of Alkenes
作者:Chisato Wata、Takuya Hashimoto
DOI:10.1021/jacs.0c11440
日期:2021.2.3
Metal-free, catalytic enantioselective intermolecular oxyamination of alkenes is realized by use of organoiodine(I/III) chemistry. The protocol is applicable toward aryl- and alkyl-substituted alkenes with high enantioselectivity and electronically controlled regioselectivity. The oxyaminated products can be easily deprotected in one step to reveal free amino alcohols in high yields without loss of
Cyclopropanation of Protected Chiral, Acyclic Allylic Alcohols: Expedient Access to the <i>a</i><i>nti</i>-Cyclopropylcarbinol Derivatives
作者:André B. Charette、Marie-Christine Lacasse
DOI:10.1021/ol0264051
日期:2002.10.1
The diastereoselective cyclopropanation of silyl-protected chiral allylicalcoholsusing Shi's carbenoid (TFA-Et(2)Zn-CH(2)I(2)) gave access to the anti-cyclopropylcarbinyl silyl ethers with excellent diastereocontrol. The level of stereocontrol was shown to depend on the sizes of the protective group and the allylic substituent. [reaction: see text]